Cleaning validation
Cleaning validation is documented evidence that a cleaning procedure consistently reduces residues of product, cleaning agent and microorganisms to levels justified by health-based exposure limits.
Cleaning validation is documented evidence that a cleaning procedure consistently reduces residues of product, cleaning agent and microorganisms to levels justified by health-based exposure limits.
Plain-English explanation, then the primary regulation it comes from.
Understanding cleaning validation
The basis for limits changed materially. Older approaches used arbitrary conventions such as one-thousandth of a therapeutic dose or a fixed 10 ppm. Current expectation is that limits derive from health-based exposure limits — a permitted daily exposure (PDE) established from toxicological data by a suitably qualified person. Sites still running historical conventions without an HBEL rationale carry a well-known and easily identified gap.
Worst-case selection is what makes the programme affordable, and it needs a documented rationale. Products are grouped and the worst case chosen on solubility, toxicity, potency and difficulty of cleaning; equipment on hardest-to-clean locations. The rationale should be revisited whenever the product portfolio changes — a new high-potency product can invalidate a grouping established years earlier.
Visual inspection is necessary but not sufficient on its own. It is a useful and sensitive check when the visible residue limit has been determined and operators are qualified against it, but 'visually clean' as the sole acceptance criterion does not demonstrate residues are below a health-based limit. Both are needed: the analytical limit, and the visual check that confirms nothing gross has been missed.
The parameters people forget are the boundaries: dirty and clean hold times. A cleaning procedure validated with a two-hour dirty hold does not evidence anything about equipment left overnight before cleaning, and campaign lengths need the same treatment.
- Health-based limits
- PDE/HBEL established from toxicological data by a qualified expert, not by legacy convention.
- Worst case, justified
- Product grouping and hardest-to-clean locations selected with a documented rationale.
- Recovery studies
- Sampling methods — swab and rinse — validated for recovery from the actual surfaces.
- Hold times and campaigns
- Dirty hold, clean hold and maximum campaign length defined and validated.
- Visual check plus analysis
- Visually clean supports, but does not replace, a health-based analytical limit.
- Dedicated facilities where required
- Some products cannot be managed by cleaning alone and require segregation.
Common failure modes
- Limits carried over from historical practice with no HBEL rationale.
- Worst-case grouping never revisited after new products entered the portfolio.
- Recovery studies performed on coupons that do not represent actual equipment surfaces.
- Hold times undefined, so real operational delays fall outside anything that was validated.
Where this is written down
- European CommissionEudraLex Volume 4 — EU GMP guidelines
Annex 15, section 10 — Cleaning Validation
- EMAEuropean Medicines Agency
EMA guideline on setting health-based exposure limits (PDE) for shared facilities
- ICHICH Q7 — GMP for Active Pharmaceutical Ingredients
For cleaning in API manufacture
Read next
Validation
ReadTechnicalAnnex 15 — qualification and validation
ReadTechnicalProcess validation
ReadTechnicalQualification (URS, DQ, IQ, OQ, PQ)
ReadLooking for a definition rather than an explanation? The GMP glossary covers the abbreviations in one line each.
Knowing the requirement is not the same as closing the gap
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