What Should a Cleanroom Cleaning SOP Include?

The sections every cleanroom cleaning SOP needs

Formats vary between companies, but auditors expect to find the same content wherever it sits, and they read the procedure next to the log to see whether the two agree. The table maps each section to what it must actually say.

Writing the method so two people clean the same way

Vague verbs are the enemy of a cleaning procedure. Words such as thoroughly, as needed or regularly cannot be trained or audited. A method section should say where to start (the far corner, highest surface first), which way to move (toward the exit, clean to dirty), how strokes overlap, how a wiper is folded and when it is turned to a fresh face, how mop solution is kept separate from dirty water, and how long the surface stays wet.

Many sites keep the SOP at the level of principle and add room-specific work instructions: a floor plan with the cleaning path drawn on it, photos of each surface, and the order in which equipment is wiped. Work instructions are easier to update when a room changes, as long as they sit under the same document control.

Approvals, review and document control

Under 21 CFR 211.22 the quality control unit approves procedures that affect drug quality, and cleaning procedures qualify. A typical approval chain is the author, the owner of the area and quality assurance. Staff are trained on a new version before its effective date, not after.

Review intervals depend on the setting. USP chapter 797 requires the designated person in a compounding pharmacy to review SOPs every 12 months and document the review. Manufacturers set a periodic review interval in their document control procedure, and any change of agent, room layout or method triggers a revision through change control rather than a handwritten note on the posted copy.

Aligning a contractor's procedure with your quality system

There are three workable models. In the first, the contractor follows the client's SOPs as written, and its staff are trained on them like employees. In the second, the contractor writes its own procedure and the client's quality unit approves it as a controlled document. In the third, a contractor procedure covers general technique and a client appendix covers site specifics.

Whichever model is chosen, a written agreement should state who owns each document, who trains whom, how deviations are reported, and that the contractor cannot change agents, tools or methods without going through the client's change control. FDA's sanitation rule at 21 CFR 211.56(d) makes clear that the procedures bind contractors as fully as employees.

Gaps auditors find most often

Most findings come from a mismatch between the procedure, the log and what actually happens on the floor. Checking for these before an audit is far cheaper than answering for them during one.

• Agent concentration or contact time missing from the method
• No in-use expiry for diluted solutions
• Frequencies in the SOP that do not match the log form
• No instruction for spills or restart after a shutdown
• Contractor staff missing from the training matrix
• Posted copies that are not the current version

Working to your SOP with EBS

EBS has more than 25 years of commercial cleaning experience, and its cleanroom programs are built to align with ISO and GMP requirements. Before service starts, a supervisor reviews your cleaning procedures, gowning rules and log forms, and the scope is written around them. Field supervisors inspect the work, and cleaning logs and service reports give your quality unit the evidence that the procedure was followed.