Commercial cleaner screening questions: night routes, client sites, disinfectant contact times and keys
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Commercial cleaner screening questions should establish whether the candidate can work nights or early mornings across one or more client buildings, often alone, at the production rate the contract allows, and whether they can be trusted with keys, alarm codes and offices full of other people's things. Then test the habits that protect the contract: following each site's checklist, using disinfectants for the full contact time on the label, handling chemicals with the training OSHA requires, keeping floors safe while they are wet, and reporting problems to the supervisor and the client. As of October 2026, California also requires janitorial contractors to register with the state and give biennial in-person harassment prevention training.
This page is for contract cleaning companies and agencies staffing them. If the cleaner will be an in-house employee of one building, such as a school or hospital, use custodian screening questions, which covers floor care, balers and compactors and bloodborne pathogens in depth. Hotel and senior living room attendants are in housekeeper screening questions, and a job ad is in the janitor job description template.
Which cleaning contract is it?
| Contract | What changes | Ask the candidate |
|---|---|---|
| Office buildings, nightly | Evening shifts after tenants leave, large square footage, restrooms, trash, vacuuming, alarm codes | "How many square feet did you clean a night, and in how many hours?" |
| Medical and dental offices | Disinfectant contact times, exam rooms, possible blood and sharps, patient privacy | "What did you do differently in an exam room than an office?" |
| Retail and grocery overnight | Floor machines, stripping and refinishing, working around stockers and security | "Which floor machines have you run on your own?" |
| Multi-site route | Driving between several small sites a night, own vehicle or company van, keys for each | "How did you keep keys and codes for several buildings straight?" |
| Day porter | Daytime cleaning with tenants present, restocking, spills, lobby and restroom checks | "How did you clean a restroom while people still needed to use it?" |
| Post-construction | Dust, debris, ladders, stickers and paint on glass, tight handover deadlines | "What did your crew do on the final clean before a handover?" |
Rules that shape a commercial cleaning screen
As of October 2026, not legal advice. These are the employer's duties under federal and California rules; other states may add their own. They shape what you ask and what you tell the candidate.
- Chemical training. OSHA's Hazard Communication standard, 29 CFR 1910.1200(h), requires employers to give employees effective information and training on the hazardous chemicals in their work area at initial assignment and whenever a new chemical hazard is introduced, with safety data sheets and labels available.
- Blood and sharps. Where cleaners have reasonably anticipated contact with blood or other potentially infectious materials, as in medical offices or when cleaning up blood, the bloodborne pathogens standard, 29 CFR 1910.1030, requires training at initial assignment and at least annually, and the employer must offer hepatitis B vaccination.
- Disinfectant labels. The EPA's guidance on registered disinfectants tells users to follow the label's directions for use, defines contact time as the time the product must remain on the surface to be effective, and says the surface should stay visibly wet for the entire contact time.
- Wet floors. OSHA's walking-working surfaces rule, 29 CFR 1910.22, requires floors to be kept clean and, as far as feasible, dry, and free of hazards such as spills. That makes signage, drying and timing part of the job.
- California janitorial employers. Under the Property Service Workers Protection Act, janitorial employers register with the Labor Commissioner and renew annually, and must provide in-person sexual violence and harassment prevention training to nonsupervisory and supervisory workers every two years (Labor Code section 1429.5). If you place cleaners with a California contractor, confirm its registration.
- Balers and compactors. If the route includes running a cardboard baler or trash compactor, Hazardous Occupations Order 12 (29 CFR 570.63) bars workers under 18 from that task, with narrow exceptions. "Are you at least 18?" is then a job-related question.
Knockout questions
| Question | What a strong answer sounds like | Red flags |
|---|---|---|
| The shift is [days], [start] to [end], after the tenants leave. Can you work that every week? | Yes, or a specific conflict stated now. | Wants daytime hours for a nights-only contract. |
| The route covers [number] buildings in [area]. How will you get between them? | Own reliable transport, or the company vehicle with a valid license if the job requires driving. | No plan for getting between sites after transit stops. |
| The client requires a background check before you get keys or a badge. Are you willing to complete it? | Yes. | Asks if they can start without it. |
| You will often work alone in the building. Are you comfortable with that? | Yes, often with how they stayed in touch with a supervisor before. | Needs constant supervision to stay on task. |
| The job involves standing and walking for the full shift, pushing carts and machines, emptying trash and using ladders. Can you do that, with or without reasonable accommodation? | Yes. | None from the answer. No medical follow-ups. |
Route and production questions
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"Walk me through your last route from the moment you unlocked the building."
- Strong answer: a sequence: disarm the alarm, check the log or client notes, trash first, then dusting top to bottom, restrooms, break room, vacuuming last, lights and doors checked, alarm set, log signed.
- Red flags: tasks in no order, or "whatever looked dirty".
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"How many square feet did you clean, in how many hours?"
- Strong answer: numbers and the scope behind them: carpeted offices versus restrooms, how many restrooms, whether they vacuumed every night.
- Red flags: a large number with no idea of the scope.
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"Did your team clean by zone or by task?"
- Strong answer: knows the difference: one person owning an area (zone) versus specialists for trash, restrooms, vacuuming and dusting moving through the building (team cleaning), and which they prefer and why.
- Red flags: cannot describe how work was divided.
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"What happened when a client inspection or complaint flagged something you missed?"
- Strong answer: a specific miss, fixed the next night, a change to their routine so it did not recur.
- Red flags: "We never got complaints," or blames the client.
Checking a production claim (invented example)
A candidate says they cleaned 30,000 square feet in a four-hour shift on their own. That is 7,500 square feet an hour, or about 125 square feet a minute, including trash, restrooms and vacuuming. That is plausible for open, lightly used office space with a backpack vacuum and few restrooms, and unlikely for a building with many restrooms or detailed work. Ask how long one restroom took them. The point is to find out whether the number is theirs or the contract's.
Chemicals, disinfecting and floors
| Question | What a strong answer sounds like | Red flags |
|---|---|---|
| How do you use a disinfectant on a restroom counter? | Cleans first if the label requires it, applies enough for the surface to stay wet for the label's contact time, then wipes. Knows the contact time for the product they used. | Sprays and wipes immediately. |
| How did your last company dilute chemicals? | A dispensing system or the label's ratio, labeled secondary bottles, never mixing products. | "Eyeball it," or mixes products to make them stronger. |
| Where were the safety data sheets kept, and when did you look at one? | Knows where they were and gives an example, such as checking first aid after a splash. | Has never heard of them. |
| You find a used needle in a trash can in a medical office. What do you do? | Does not touch it with bare hands, uses the sharps procedure and container, reports it to the supervisor. | Pushes the trash down with a hand. |
| How do you mop a lobby while people are still walking through? | Wet floor signs out first, mops in sections leaving a dry path, removes signs only when dry. | No signs "because it dries fast". |
| Which floor machines have you run on your own? | Names them: auto scrubber, burnisher, carpet extractor, floor stripper, and who trained them. | Claims stripping and waxing from having watched a crew. |
Trust, keys and client sites
Contract cleaners work in client spaces with no one watching, so clients judge the contractor by the cleaner's conduct. Ask these plainly and listen for specifics.
- "How did you handle keys and alarm codes for each building?" Strong: keys on a company ring signed in and out, codes never written on the key tag, reports a lost key at once. Red flag: lends keys to a friend to cover a shift.
- "You find a stack of papers marked confidential on a desk. What do you do?" Strong: leaves them where they are, cleans around them, never reads or moves them, follows the client's rule on shredding bins. Red flag: throws them out "because they were messy".
- "The alarm goes off while you are inside. What happens next?" Strong: follows the site's procedure: enters the code, calls the monitoring company with the password if asked, tells the supervisor. Red flag: leaves the building with the alarm sounding.
- "Have you ever brought someone with you to help on a shift?" Strong: no, only authorized staff in the building. Red flag: a family member "who helps sometimes".
How commercial cleaning experience gets overstated
- Residential as commercial. House cleaning is real work, but not a 30,000 square foot route on a deadline. Ask about square footage and machines.
- Crew output as personal output. "We did the whole tower" with a crew of twelve. Ask about their floors.
- Floor care by proximity. Stripping and refinishing claimed from carrying buckets. Ask them to walk through the steps.
- Supervisor title on a two-person route. Ask who did inspections and scheduling.
Scoring the screen
Pass or fail: can work the shift; has transport between sites; agrees to the client's background check; comfortable working alone; can do the physical duties with or without accommodation; 18 or older if the route includes a baler or compactor.
Scored 0 to 2 each (10 possible):
- Route discipline: a real sequence and checklist habits.
- Production: a credible rate with the scope behind it.
- Disinfecting and chemicals: contact time, dilution, safety data sheets.
- Floor safety and equipment: signs, machines they have actually run.
- Trust: keys, alarms, confidential material and unauthorized visitors handled correctly.
In the submittal, list the building types, square footage and hours of their last route, the machines they run, transport, and their answer to the confidential papers question in their own words. When you are screening for a new contract start, Interview Signal keeps each call's transcript on your computer, so those answers come from what each candidate said rather than from memory at the end of the day.
Legal cautions
Client background check requirements do not override fair chance laws on when you may ask about criminal history; see ban-the-box interview questions. If a screening company runs the check, follow the FCRA process. Ask about work authorization only in the same way for every candidate, and never about national origin or accent; the full list is in illegal interview questions. This page is general information, not legal advice.
Questions people ask
What training does a commercial cleaner need?
No license is required in most places, but employers have training duties. OSHA's Hazard Communication standard (29 CFR 1910.1200) requires training on the hazardous chemicals in the work area at initial assignment and when a new hazard is introduced, and cleaners with reasonably anticipated contact with blood or other potentially infectious materials need bloodborne pathogens training at assignment and at least annually under 29 CFR 1910.1030. California adds biennial in-person sexual violence and harassment prevention training for janitorial workers (as of October 2026).
Do commercial cleaning companies in California have to register?
Yes. Under California's Property Service Workers Protection Act, janitorial employers that meet the statutory definition must register with the Labor Commissioner and renew every year, and must provide in-person sexual violence and harassment prevention training to nonsupervisory workers and supervisors every two years under Labor Code section 1429.5. The Labor Commissioner's office runs the registration.
How do I check whether a commercial cleaner's speed claim is realistic?
Ask for the square footage of their last route, the hours they had to clean it, and what the route included (restrooms, break rooms, trash, vacuuming, dusting). Divide the square feet by the hours and ask them to walk you through a single restroom, step by step. A number that cannot be explained by the sequence is probably the contract's target, not what they did.
Can a cleaning company require a background check for client buildings?
Many client contracts require one, especially for offices with confidential records, banks, schools and medical sites. If a screening company runs it, follow the Fair Credit Reporting Act steps: a standalone disclosure, written authorization, and a pre-adverse action notice with a copy of the report. State and city fair chance laws may control when you can ask about criminal history.