Cleanroom Cleaning SOP: Step-by-Step Procedure for Pharma (Grade A–D)

Quick answer: A cleanroom cleaning SOP is the written procedure that says who cleans, what, how often, with which agents and tools, and how it is recorded. The core method: gown to grade, remove waste, clean before you disinfect, work top to bottom and clean to dirty with overlapping parallel strokes, mop floors last towards the exit using a two- or three-bucket system, then sign the log. Sterile areas also need a disinfectant rotation that includes a sporicide.

Why does a cleanroom need a written cleaning SOP?

Because the law and the auditors both expect one. India’s Revised Schedule M requires premises to be cleaned and disinfected “according to detailed written procedures” with records kept (clause 12.2.6), and written procedures “assigning responsibility for cleaning and sanitation” that describe schedules, methods, equipment and materials (clause 17.3.10.18).

A good SOP also makes cleaning repeatable. Every cleaner, on every shift, does the same thing in the same order, so your environmental monitoring results stay stable and explainable.

What should a cleanroom cleaning SOP include?

SOP section	What to write
Purpose and scope	Which rooms and grades it covers (for example Grade C solution prep and Grade D corridors)
Responsibilities	Who cleans, who supervises, who checks and signs off; contractor vs in-house roles
Safety	PPE for the chemicals used, handling and dilution precautions
Materials and equipment	Approved detergents, disinfectants and sporicide; wipes, mops, buckets and their colour code per grade
Preparation	Dilution, expiry of prepared solutions, sterile agents for Grade A/B, tool sterilisation or replacement
Gowning	Reference to the gowning SOP for each grade
Procedure	Step-by-step order of cleaning for each area type (surfaces, walls, ceilings, floors, equipment exteriors)
Frequency	Per session, daily, weekly, monthly, and after shutdowns or maintenance
Disinfectant rotation	Which agent on which days, contact times, sporicide schedule
Records	The log to sign, what to record, supervisor review
Deviations	What to do if a step is missed, a spill happens or EM results exceed limits
Training	Training and requalification needed before someone may clean the area

How do you prepare before cleaning a cleanroom?

Preparation decides whether the clean helps or hurts. Before entering:

Check the schedule and agent of the day on the rotation sheet
Prepare solutions fresh at the approved dilution, label with time and expiry; use sterile agents in Grade A/B (Schedule M Part II, para 3.2)
Collect grade-dedicated, colour-coded tools: never bring a tool from a lower grade into a higher one
Remove jewellery, watches and cosmetics (Part II, para 7.7)
Gown to the grade: hair covered and protective clothing for Grade D; a one-piece high-neck jumpsuit for Grade C; full headgear, one-piece suit, face mask, sterile powder-free gloves and sterilised footwear for Grade A/B (Part II, para 7.8)
Wash and sanitise hands before entering production areas (clause 11.5.2)
Confirm the area is ready: production stopped or between batches, materials cleared, line clearance done

Step-by-step cleanroom cleaning procedure

Enter and stage materials. Bring in only the tools and solutions needed, wiped down at the airlock or pass box.
Remove waste first. Empty and bag bins, and remove packaging and debris so you don’t spread it while cleaning.
Clean before you disinfect. Remove visible soil with a detergent step first. Disinfectants cannot work properly on dirty surfaces (RSSL).
Work top to bottom. Ceilings and high fixtures, then walls, then equipment exteriors and work surfaces, then floors last, so falling particles land on surfaces not yet cleaned.
Go clean to dirty, back to front. Start at the cleanest point, farthest from the door, and work towards the exit (Berkshire, citing ISO 14644-5).
- Wipe in overlapping, parallel, single-direction strokes. Never wipe in circles, which drags dirt back over clean areas.
- Fold wipes and turn to a fresh face often; replace them once all faces are used.
Mop floors last, towards the exit. Use a two- or three-bucket system, never one bucket:
- Three-bucket method: dip the mop in disinfectant, mop a set area, rinse it in clean water, wring it into the empty waste bucket, then reload with disinfectant. Never double-dip.
- Set a maximum area per dip and per solution change in your SOP (one reference example uses 10 m² per dip and 22 m² per solution change).
Leave the disinfectant wet for its full contact time. Don’t wipe it off early; the label contact time is when it works.
Remove residues. Periodically wipe surfaces with sterile water or 70% IPA so disinfectant residues don’t build up.
Exit and dispose. Bag used wipes and mop heads, empty and clean buckets, and send reusable items for laundering or sterilisation.
Record it at once. Sign and time the log for the area before leaving, with the agent used, then have a supervisor check it.

How often should each cleanroom grade be cleaned?

Frequencies are set by your own validated SOP and environmental monitoring data. This table shows typical practice:

Grade	Surfaces and floors	Walls and equipment exteriors	Ceilings and high fixtures	Sporicide
A / B	Every session or shift	Daily to weekly	Weekly to monthly	Weekly or per rotation plan
C	Daily	Weekly	Monthly	Monthly or per rotation plan
D	Daily	Weekly to monthly	Monthly	Periodic, per rotation plan

Disinfectant rotation: Schedule M requires sterile clean areas to use more than one type of disinfectant and to include a sporicidal agent, because common disinfectants don’t kill spores (Part II, paras 3.1 and 3.3). A typical rotation pairs a daily disinfectant (for example a quaternary ammonium or alcohol-based agent) with an alternate agent and a scheduled sporicide (for example hydrogen peroxide–peracetic acid). Your QA team chooses the agents and proves they work on your facility’s organisms.

Also clean after shutdowns, maintenance work, spills and any out-of-limit environmental monitoring result.

Common cleanroom cleaning mistakes

Mistake	Why it’s a problem	Do this instead
Wiping in circles	Drags dirt back over cleaned areas	Overlapping, parallel, single-direction strokes
One-bucket mopping	Mop dirties the solution and spreads contamination	Two- or three-bucket system with a wringer over the waste bucket
Double-dipping the mop	Recontaminates the disinfectant	Rinse and wring before every reload
Disinfecting without cleaning first	Soil shields microbes from the disinfectant	Detergent step, then disinfectant
Wiping off disinfectant too soon	Contact time not met, microbes survive	Leave surfaces wet for the full label time
Same tools across grades	Moves contamination up the grades	Colour-coded, grade-dedicated tools
Never using a sporicide	Spores survive routine disinfectants	Scheduled sporicidal rounds (Schedule M Part II, 3.3)
Filling logs at shift end	Records can’t prove what was done	Sign at the point of cleaning
Untrained or unrecorded cleaners	Schedule M requires trained cleaning staff (Part II, 7.2)	Documented training and gowning qualification

How PinkClean follows your cleanroom SOP

PinkClean is a member of the Contamination Control Society of India (CCSI) and an ISO-certified cleaning company. We clean Grade A–D and ISO 5–8 areas for pharma, biotech and electronics plants in Bangalore, Hyderabad, Goa and Kochi.

When PinkClean takes over your cleanroom cleaning, we work to your validated SOP:

Crews trained on your SOP and gowning procedure before they enter, with training records for your files
Three-bucket mopping and grade-dedicated tools as standard
Your disinfectant rotation and sporicide schedule, prepared and logged as written
Point-of-cleaning sign-off with supervisor checks every shift

New to cleanroom grades? Start with our guide to cleanroom classification: ISO 14644 vs Grades A–D.

Frequently asked questions

What is a cleanroom cleaning SOP?

A cleanroom cleaning SOP is a written standard operating procedure that defines who cleans a cleanroom, how often, with which agents and tools, in what order, and how the cleaning is recorded.

What is the correct order for cleaning a cleanroom?

Remove waste, clean before disinfecting, and work top to bottom: ceilings, walls, equipment and work surfaces, then floors last. Move from the cleanest area to the dirtiest, finishing at the exit.

What is the three-bucket mopping system?

One bucket holds disinfectant, one holds clean rinse water and one is empty for waste. The mop is loaded with disinfectant, used on a set area, rinsed, wrung into the waste bucket, then reloaded, so the disinfectant stays clean.

Should you wipe cleanroom surfaces in circles?

No. Use overlapping, parallel strokes in one direction. Circular wiping drags contamination back over areas you have just cleaned.

Why is a sporicide needed in cleanroom cleaning?

Many common disinfectants don’t kill bacterial spores. India’s Schedule M requires the disinfectant programme for sterile clean areas to include a sporicidal agent.

How often should a Grade A cleanroom be cleaned?

Grade A and B areas are typically cleaned every session or shift, before and after operations, as set by the plant’s validated SOP and environmental monitoring results.

Can cleanroom cleaning be outsourced?

Yes. A cleaning contractor can do it if its staff are trained on the plant’s SOP and gowning procedure and keep the required records. The plant remains responsible for GMP compliance.

Want your cleanroom cleaned to SOP, every shift?

PinkClean, a CCSI member and ISO-certified company, provides SOP-driven cleanroom cleaning for pharma, biotech and electronics plants in Bangalore, Hyderabad, Goa and Kochi. Book a free site assessment and we’ll review your SOP, grades and cleaning schedule.

📞 Bangalore: 96065 10235 · Mangalore: 91084 44692 · 🌐 pinkcleanindia.com

This guide describes common good practice. Always follow your site’s validated SOPs and QA instructions.