WebOfPharma · GMP documentation

Cleaning Validation SOP: Procedure and Example

A practical guide to writing and using a controlled cleaning-validation SOP for pharmaceutical equipment, with manual and CIP examples.

SOP structure Manual & CIP cleaning GMP records Audit readiness

Cleaning Validation SOP: Procedure and Example

Quick answer: A Cleaning Validation SOP is the controlled instruction that tells trained personnel how to clean pharmaceutical equipment consistently and how to document the activity. It should define the equipment status, preparation and disassembly, detergent and water controls, cleaning sequence, rinsing, drying, visual inspection, sampling, records, deviations, training, change control and revalidation. The validation protocol then provides the scientific evidence that the approved SOP works reproducibly.

A cleaning procedure becomes GMP-reliable only when people can perform it the same way, equipment can be inspected and sampled consistently, and the records prove what actually happened. A well-designed Cleaning Validation SOP connects the approved cleaning method to the site’s risk assessment, contamination-control strategy, analytical methods and Quality review. This article explains the required structure, gives a step-by-step procedure, and provides practical manual and clean-in-place examples that can be adapted to a pharmaceutical facility.

The article complements the broader Cleaning Validation in Pharmaceuticals lifecycle. Your site must adapt the content to dosage form, equipment design, product toxicology, utility quality and applicable national requirements.

Regulatory note: PIC/S PI 006-4 treats cleaning as a lifecycle activity that includes cleaning-process development, a validation study and ongoing evaluation. Verify the current PIC/S publication, local GMP implementation and your approved Quality System before issuing a controlled SOP.

What is a Cleaning Validation SOP?

A Cleaning Validation SOP is a controlled, approved document that describes how equipment is cleaned, inspected, sampled, recorded and released after product manufacture. It is written for routine execution, not as a narrative explanation of the entire validation study.

The SOP should make critical cleaning variables visible and reproducible. An operator should not have to decide how much detergent to use, how long to scrub, which parts to disassemble, where to inspect or how to record an unexpected event. Those decisions belong in the approved procedure and its associated risk assessment.

The validation protocol has a different purpose. It defines how the site will challenge and prove the procedure using worst-case products, hold times, sampling, recovery, analytical methods and acceptance criteria. The SOP tells people how to clean; the protocol demonstrates that the cleaning method works.

Why the SOP matters under GMP

Cleaning controls reduce the risk of cross-contamination, detergent carryover and microbial contamination. Under cGMP, the procedure must be consistent with equipment design, product risk, approved limits and the facility’s contamination-control strategy.

A good SOP provides evidence that:

only trained and authorised personnel perform cleaning;
the correct equipment, previous product and cleaning status are identified;
cleaning parameters are controlled rather than left to personal preference;
hard-to-clean parts are addressed, including parts that are not direct product-contact surfaces but could allow migration;
visual inspection and analytical verification are performed at the required frequency;
records are complete, traceable and available for review;
deviations and repeated failures trigger investigation, CAPA or revalidation.

Cleaning SOP and validation protocol: key differences

Document	Main purpose	Typical content
Cleaning Validation SOP	Control routine cleaning execution and records.	Cleaning sequence, tools, detergent, parameters, inspection, sampling, records and escalation.
Cleaning Validation Protocol	Prove the cleaning process is effective and reproducible.	Scope, worst case, MACO/HBEL limits, run count, sampling map, recovery, analytical methods and acceptance criteria.
Cleaning Validation Report	Conclude whether the planned study met its criteria.	Executed data, calculations, deviations, investigations, limitations and ongoing verification plan.
Cleaning Record	Show what happened during a specific cleaning event.	Equipment, product, operator, time, SOP revision, parameters, inspection, samples and signatures.

Use the site’s controlled SOP system for document numbering, approvals, training, distribution and effective dates. Avoid copying validation limits into several uncontrolled forms; reference the approved source and control revisions.

Recommended SOP structure

Purpose

State the contamination-control outcome and equipment covered.

Scope

Define areas, equipment, products, cleaning types and exclusions.

Roles

Assign Production, QC, QA, Engineering and contractor duties.

Procedure

Describe each cleaning action and critical parameter.

A practical SOP normally contains the following sections:

document control and revision history;
purpose and scope;
definitions and abbreviations;
responsibilities and training requirements;
safety and environmental precautions;
equipment, tools, materials and detergents;
pre-cleaning checks and line clearance;
manual, COP or CIP cleaning procedure;
visual inspection, sampling and equipment-release rules;
records, attachments and data-integrity controls;
deviation, failure, CAPA, change-control and revalidation requirements;
references and forms.

Step 1: Control the document before use

The first page should identify the SOP title, number, version, effective date, superseded version, department, page numbering and approval signatures. Electronic copies must be issued through the approved document-management system. Printed copies should be controlled or clearly marked as uncontrolled when used for reference.

Document-control checks

current version is available at the point of use;
obsolete versions are removed or clearly prevented from use;
changes are described in the revision history;
affected training is completed before the effective date;
attachments, cleaning maps and forms have matching revisions;
the SOP is periodically reviewed for continued suitability.

Document control is part of the quality system, not an administrative afterthought. A technically correct cleaning procedure cannot protect a product if operators are using an obsolete revision.

Step 2: Define purpose, scope and equipment status

State exactly what the SOP controls. For example: “This procedure applies to cleaning of the product-contact surfaces and specified adjacent components of the 500 L manufacturing vessel, transfer line and filling hopper after manufacture of non-sterile oral liquids.”

List equipment IDs, rooms, product families and cleaning types. Define whether the instruction covers:

routine product-to-product changeover;
same-product campaign cleaning;
cleaning after maintenance or long shutdown;
manual cleaning, COP, CIP or a hybrid method;
chemical residues, detergents, microbial contamination or endotoxin controls.

Describe equipment status labels such as “dirty,” “under cleaning,” “clean,” “cleaned and awaiting inspection” and “released.” The status must be unambiguous and linked to the equipment record.

Step 3: Assign roles, competency and training

Cleaning is a multidisciplinary activity. The SOP should state who performs the work, who verifies it, who collects samples, who reviews results and who releases the equipment.

Role	Required responsibility	Minimum evidence
Cleaning operator	Perform each step as written and record actual values contemporaneously.	Training and, for manual cleaning, practical qualification or observed assessment.
Supervisor	Confirm the procedure was followed and review the completed record.	Signed review with date and time.
Quality Unit	Approve the SOP, assess failures and authorise release or escalation.	Approval, deviation and release records.
QC or Microbiology	Collect or test samples using approved methods.	Sampling training, method records and raw data.
Engineering	Maintain qualified equipment, instruments, utilities and automation.	Calibration, preventive maintenance and change-control records.

Training should cover the equipment design, cleaning chemistry, safety, disassembly, sampling technique, visual inspection and documentation expectations. Swabbing personnel should demonstrate the same technique used during recovery studies.

Step 4: Define tools, materials and detergent controls

List approved cleaning tools and materials by name or controlled item code. Do not allow operators to substitute brushes, wipes or hoses without an approved assessment.

Material controls to include

detergent name, supplier, composition and approved concentration;
water grade, temperature and quality requirements;
brush, wipe, sponge, hose, spray nozzle and vacuum specifications;
container identification, expiry or retest date and lot number;
storage, preparation, dilution and disposal requirements;
compatibility with stainless steel, plastics, elastomers and coatings.

Detergent composition should be known and changes to formulation should be notified and assessed. The SOP should explain how the operator verifies concentration, for example by measured volume, conductivity, titration or another approved method. Measuring devices must be calibrated when their readings affect the cleaning decision.

Step 5: Perform pre-cleaning checks and line clearance

Before cleaning begins, confirm that production has ended and the equipment is safe, identifiable and ready. The pre-cleaning section prevents mix-ups and makes the dirty-hold interval traceable.

production batch and previous product are identified;
equipment is isolated, depressurised and safe to open;
all product, labels, documents and waste are removed;
reusable parts are identified and segregated;
dirty-hold start time is recorded;
equipment status is changed to “under cleaning.”

correct cleaning SOP revision is available;
detergent, water and tools are within approval;
calibration and maintenance status is acceptable;
required PPE and safety controls are in place;
sampling materials are available if verification is planned;
any abnormal condition is reported before work starts.

If the equipment has exceeded the approved dirty-hold time, stop and notify Quality. Do not silently continue and backfill the record.

Step 6: Execute disassembly and product removal

The SOP should use photographs, diagrams or numbered equipment maps when disassembly is complex. Identify parts that must be removed, protected or cleaned separately. The sequence should prevent residue from spreading to already-clean areas.

Verify the equipment is safe to open and isolate utilities where required.
Remove detachable parts in the stated order and place them in the designated cleaning area.
Remove gross product using the approved dry or wet method.
Protect sensors, electrical components and non-compatible materials.
Inspect powder traps, seals, valves, filters, screens, corners and drains before washing.
Record any abnormal residue, damage or missing component as a deviation or maintenance event.

For powder products, uncontrolled compressed air can spread contamination. For wet products, prevent uncontrolled pooling or splashing. The SOP should be specific enough to address the actual hazard of the dosage form.

Step 7: Apply detergent and mechanical action

Define detergent concentration, volume, temperature, contact time and application method. For manual cleaning, describe the required mechanical action rather than simply writing “scrub thoroughly.” For CIP, specify recipe steps, flow, pressure, spray coverage, valve position and alarms.

Manual cleaning example

1. Prepare detergent at 2.0% v/v using purified water at 45–55 °C. 2. Soak removable parts for 10 minutes. 3. Scrub each surface with the approved nylon brush using 20 controlled strokes. 4. Flush the vessel outlet and transfer line for not less than 5 minutes. 5. Rinse with purified water until the approved endpoint is achieved. 6. Drain, dry and inspect all parts before reassembly.

The controlled SOP should use the site’s approved formatting. Actual values must remain within the validated ranges. If the operator cannot meet a parameter, the event must be recorded and escalated rather than corrected retrospectively.

Critical cleaning parameters

detergent identity and concentration;
temperature and contact time;
flow, pressure, spray rate and volume for automated cleaning;
mechanical action, brush type and number of passes for manual cleaning;
rinse endpoint, water quality and final drying condition;
maximum dirty hold, campaign length and clean hold.

Step 8: Rinse, drain and dry the equipment

Rinsing must remove detergent and loosened residues without creating new contamination. The SOP should specify water grade, temperature, pressure, volume or time and, where applicable, a conductivity, pH, TOC or visual endpoint.

Drainage and drying are essential controls. Stagnant water can support microbial growth, and trapped moisture may dilute or hide residues. Define the equipment orientation, drain points, drying method, drying time and protection from recontamination.

When clean equipment is held before use, apply the approved clean-hold time and storage condition. If the equipment exceeds the clean hold, treat it according to the deviation or re-cleaning instruction.

Step 9: Perform visual inspection and sampling

Visual inspection should occur after equipment has dried unless a documented risk assessment justifies another condition. The inspector should use suitable lighting and any required mirror, borescope or disassembly instruction. The minimum criterion is “visually clean,” but visual inspection alone may not detect residues below the visual threshold.

Where analytical verification is required, the SOP should reference the approved sampling plan. Swab sampling is generally preferred when hard-to-clean locations are accessible. Rinse sampling is useful for large or inaccessible areas, but it can average results and hide a localised residue.

Sampling record fields

equipment and location ID;
previous product and batch;
sample method, solvent and material;
sample area or rinse volume;
sampler name, date and time;
sample ID, storage and transfer conditions;
requested test, limit and result.

Sampling and laboratory records should follow ALCOA+ principles. That means the record is attributable, legible, contemporaneous, original, accurate, complete, consistent, enduring and available.

Step 10: Release equipment after review

Define who can release equipment and what evidence must be available. Release may be based on visual inspection, analytical results, microbial results or a combination defined by the risk assessment.

Release condition	Required evidence	Action if not met
Visual cleanliness	Documented inspection after drying by trained personnel.	Keep equipment on hold, investigate and re-clean only under an approved decision.
Chemical residue	Validated swab or rinse result below the approved limit.	Open a deviation, assess product/equipment impact and follow CAPA or revalidation rules.
Detergent residue	Approved detergent criterion and valid analytical or endpoint result.	Do not release until the risk and result are evaluated by Quality.
Microbial control	Applicable microbial or endotoxin result and storage/hold compliance.	Quarantine, investigate and assess cleaning, drying and storage controls.

The operator should not release equipment by signing a blank form. The record must show the actual inspection and the reviewer’s decision. Where electronic signatures are used, apply approved controls for electronic records and signatures, including applicable 21 CFR requirements.

Example: manual cleaning SOP for a manufacturing vessel

The following example is an educational model. The facility must replace the values with validated limits and approved equipment-specific instructions.

SOP step	Example instruction	Record required
1. Identify	Confirm vessel V-201, previous batch number and product status.	Equipment ID, product, batch and operator.
2. Hold time	Record production end and cleaning start; maximum dirty hold is 8 hours.	Actual date and times.
3. Disassemble	Remove spray ball, outlet screen, gasket and sample valve according to diagram D-201.	Parts removed and condition.
4. Pre-rinse	Rinse with purified water at 40–50 °C until visible product is removed.	Water temperature and endpoint.
5. Detergent	Apply approved detergent at 2.0% v/v, 45–55 °C, with 10-minute contact.	Detergent lot, concentration, temperature and start/end time.
6. Scrub	Use the approved nylon brush on welds, outlet, gasket groove and sample valve.	Operator initials and abnormal observations.
7. Final rinse	Rinse with purified water until pH and conductivity meet the approved endpoint.	Measurements and instrument ID.
8. Dry	Drain fully and dry with filtered air; keep vessel covered.	Drying start/end and storage status.
9. Inspect	Inspect dry surfaces using the approved light and checklist.	Inspector, date, time and result.
10. Release	Quality reviews required samples and releases the vessel for the next approved use.	Release signature and date.

Example: CIP cleaning SOP sequence

For a CIP system, the SOP should reference a controlled recipe and describe how the operator confirms the correct version. It should also state what to do when an alarm, interlock or parameter excursion occurs.

Confirm the equipment train, recipe number and cleaning status.
Verify detergent tank concentration, water quality, instrument calibration and spray-device status.
Run the approved pre-rinse and record temperature, flow and time.
Run the detergent wash within the validated temperature, concentration, pressure and flow ranges.
Run the intermediate and final rinse until the approved endpoint is achieved.
Confirm drainability, dry-air step and absence of standing water.
Review the electronic cycle record, alarms, audit trail and recipe version.
Perform visual inspection and required verification sampling.
Escalate any failed parameter, alarm or incomplete cycle before release.

CIP data should be protected against accidental or intentional modification or deletion. The system should have controlled access, audit trails, backup and review procedures. A CIP cycle that finished without an alarm is not automatically a validated cycle if critical data are missing or the recipe was not authorised.

Cleaning limits and detergent acceptance criteria

The SOP should not invent residue limits. It should reference the current approved limit matrix or cleaning-validation report. Product carryover limits are normally based on toxicological assessment such as HBEL or PDE, therapeutic dose, potency, batch size, surface area and process-train effects.

Detergent limits should be scientifically justified and practical to verify. The detergent composition must be known, and the cleaning process should demonstrate that residue is removed. Where appropriate, the target may be no detectable residue, but the analytical method and detection capability must support that decision.

Do not use a generic limit without approval. If product, batch size, next-product dose, equipment surface area or toxicology changes, the limit may need to be reassessed through change control.

Hold times, campaigns and microbial control

The SOP should define or reference the maximum dirty hold, clean hold and campaign length supported by validation evidence. Dirty residue may dry or become more difficult to remove. A cleaned but wet system may support microbial growth or become recontaminated during storage.

Record the end of production and start of cleaning.
Keep wet equipment drained and dry unless a validated wet-storage condition exists.
Protect cleaned parts from dust, splash and handling contamination.
Define the re-cleaning or Quality decision when the clean hold is exceeded.
Assess microbial and endotoxin risk for aqueous, biological or long-hold processes.

Deviations, failures and CAPA

The SOP must tell personnel what to do when a step cannot be completed, a parameter falls outside its range, a visual inspection fails, a sample is missing or a laboratory result exceeds its limit.

Stop or place the equipment on hold according to the risk and approved instruction.
Record the event immediately; never erase or backdate the record.
Notify the supervisor and Quality Unit.
Assess product, equipment, sample and data impact.
Investigate root cause using evidence, not assumptions.
Define correction, corrective action and preventive action.
Evaluate the need for re-cleaning, expanded sampling, change control or revalidation.

Use the site’s CAPA procedure for systemic action and link repeat failures to the broader CAPA program. Repeated “clean-and-test-until-pass” cycles are not an acceptable substitute for an investigation.

Data integrity and cleaning records

Cleaning records are GMP data. They should be completed at the time of activity using permanent, readable entries or validated electronic systems. Corrections must preserve the original entry, show the reason, identify the person and retain the date and time.

ALCOA+ expectations for the SOP

Attributable: identify the operator, inspector, sampler and reviewer.
Legible: use readable entries and approved correction practices.
Contemporaneous: record parameters when they occur, not at the end of the shift.
Original: preserve original paper, electronic recipe and instrument data.
Accurate: record actual values, units, instrument IDs and calculations.
Complete: retain failed results, alarms, deviations and attachments.
Consistent, enduring and available: maintain chronology, retention, backup and retrieval.

When electronic records or signatures are used, ensure validated access controls, audit-trail review, backup and retention. The SOP should define who reviews electronic cycle data and how missing or altered data are escalated.

Equipment qualification and change control

Cleaning is affected by equipment design, installation, operation and performance. For a new or modified system, link the cleaning SOP and validation package to the URS, DQ, IQ, OQ and PQ evidence.

Use change control before changing:

equipment, surface finish, gasket, hose, filter or spray device;
product, formulation, strength, batch size or process sequence;
detergent supplier, formulation, concentration or preparation;
water quality, pressure, temperature, flow or utility configuration;
cleaning time, campaign length, dirty hold or clean hold;
sampling method, analytical method, acceptance limit or record format.

Quality should approve the impact assessment and decide whether the SOP, validation protocol, risk assessment, training or revalidation must be updated.

Training and periodic review

Training should occur before personnel perform the task independently and whenever the SOP changes. Manual cleaning should include practical observation because reading a procedure does not demonstrate that an operator can reproduce the technique.

Periodic review should consider cleaning failures, alerts, residue trends, detergent changes, equipment modifications, new products, operator observations, sampling recovery, hold-time excursions and audit findings. A review that concludes “no change” should still record the evidence and rationale.

Cleaning Validation SOP audit checklist

Current SOP number, revision and effective date
Purpose, scope, equipment and exclusions are clear
Responsibilities and training requirements are assigned
Approved detergent, water and tool controls are listed
Pre-cleaning and dirty-hold checks are documented
Disassembly and hard-to-clean locations are defined
Parameters, endpoints and acceptable ranges are specified

Drying, clean-hold and storage controls are defined
Visual inspection and sampling rules are clear
Equipment release authority is identified
Records support ALCOA+ data integrity
Deviations and failed results are escalated
Change control and revalidation triggers are stated
Periodic review and revision control are active

Common SOP weaknesses and better controls

Weakness	Why it matters	Better control
“Clean until visually clean”	It does not control chemistry, time or mechanical action.	Define parameters, endpoints and inspection conditions.
“Use suitable detergent”	Operators may use different products or concentrations.	Name the approved detergent, preparation method, lot and concentration check.
No hard-to-clean map	Critical areas can be skipped during disassembly or inspection.	Use equipment drawings, photos or numbered locations.
Blank forms completed later	Retrospective entries weaken data integrity.	Require contemporaneous entries and supervisor review.
No action for exceeded hold time	Residue or microbial risk may increase silently.	Define hold-time decision, deviation and re-cleaning rules.
Version mismatch between SOP and validation	The executed method may not be the validated method.	Link SOP revision to validation report and change control.
Repeated failures treated as operator error	Equipment or procedure design may be the true cause.	Investigate systemically and link CAPA or revalidation.

Frequently asked questions

What is a Cleaning Validation SOP?

It is a controlled instruction defining how pharmaceutical equipment is prepared, cleaned, inspected, sampled, documented, released and maintained in a validated state.

What is the difference between a cleaning SOP and a validation protocol?

The cleaning SOP tells trained operators how to clean routinely. The validation protocol explains how the site will prove that the approved SOP is effective, reproducible and supported by evidence.

What should a Cleaning Validation SOP include?

Include purpose, scope, definitions, responsibilities, safety, equipment status, cleaning steps, detergent controls, rinsing, drying, inspection, sampling, records, deviations, training, change control and revalidation requirements.

Does a Cleaning Validation SOP require three validation runs?

The SOP should not impose a universal number for every product. The validation protocol should define a predetermined number based on documented risk, equipment, product knowledge and cleaning variability.

Is visual inspection enough after cleaning?

Visual inspection is an important minimum check, but swab or rinse testing is needed when residues may be below visual detection or when chemical or microbial evidence is required.

How should manual cleaning be controlled?

Use detailed sequence instructions, defined detergent concentration and contact time, specified tools, trained operators, calibrated measuring devices, documented inspection and risk-based verification.

How are detergent residues controlled?

Know the detergent composition, demonstrate effective removal, and define an approved limit or no-detectable-residue criterion using a scientific and practical rationale.

What records are required for cleaning?

Identify equipment, previous product, operator, date and time, SOP version, actual parameters, detergent lot, inspection, samples, results, deviations and supervisor or Quality review.

When should a Cleaning Validation SOP be revised?

Revise it before changes to equipment, product, detergent, utilities, cleaning parameters, sampling, limits or hold times, and after recurring failures or periodic review findings.

How does ALCOA+ apply to cleaning records?

ALCOA+ requires data to be attributable, legible, contemporaneous, original, accurate, complete, consistent, enduring and available, including electronic recipes, audit trails and laboratory results.

Key takeaways

A Cleaning Validation SOP controls routine execution; a protocol proves the method works.
Every critical parameter should have an approved range, endpoint or decision rule.
Manual cleaning requires detailed steps, qualified operators and practical oversight.
Visual inspection is important but may not replace analytical verification.
Records must show actual activity and preserve failed results and deviations.
Changes, recurring failures and adverse trends should trigger formal assessment.
The SOP remains effective only when training, periodic review and revalidation controls are active.

Conclusion

A strong Cleaning Validation SOP makes the validated cleaning process repeatable in daily manufacturing. It removes operator guesswork, controls equipment and detergent variables, defines inspection and sampling expectations, protects data integrity and provides clear escalation when results are not acceptable. Link the SOP to the approved validation protocol, risk assessment, CAPA, change control and ongoing verification system.

Before approval, compare the procedure with current PIC/S and national GMP expectations and the site’s complete Cleaning Validation in Pharmaceuticals program.

References and further reading

PIC/S PI 006-4 Recommendations on Qualification and Validation — cleaning validation, documentation, sampling, limits and ongoing control.
PIC/S Publications — current GMP Guide and validation publications.
PIC/S PI 046-1 Health Based Exposure Limits — PDE and toxicological risk-identification principles.
Cleaning Validation in Pharmaceuticals — related WebOfPharma guide.

This article is an educational GMP overview and does not replace an approved site SOP, toxicological assessment, regulatory advice or Quality Unit approval. Verify current requirements before using it in a controlled procedure.