The Office Restroom That Smelled After Every Clean
Why this matters
"Your crew cleans every night and the restroom still smells by ten" is the complaint that loses janitorial accounts. The client can see the restroom is clean, so they conclude the crew is covering the smell with fragrance or skipping the work, and the account manager's first instinct is to send the crew back with a stronger product. In this case that would have changed nothing, because the smell had three separate sources and none of them was a missed clean. Two were in the room's own construction and one was in how the disinfectant was being used.
Before anything: is it gas
A rotten-egg smell in a building can be sewer gas, and it can also be natural gas, which carries an added odorant that smells the same way. If the smell is strong, is near a gas appliance, water heater or furnace, or anyone is unsure, everyone leaves the area, nobody operates a switch or uses a phone inside, and the call to the gas utility or 911 is made from outside. Nothing in this case is diagnosed until that question is answered. Here it was answered at once: the office was all-electric, with no gas service to the building, which the facilities contact confirmed. The odor diagnosis could proceed.
The account and the complaint
A small professional office, about 25 people on one floor, one shared restroom with a toilet, a wall-hung flush urinal, a sink, ceramic floor tile with cement grout, and a floor drain in the center of the room. The night crew cleans it Monday through Friday and disinfects the fixtures every visit. The office manager's message: the restroom smells fine when people arrive, smells by midmorning, and is worst on Mondays. She had already asked whether the crew was really disinfecting.
The account manager went in at 10 a.m. on a Tuesday, not at night after the crew, because the smell was a midmorning event and checking a freshly cleaned room at 9 p.m. would only have confirmed that the crew cleans.
Five suspects, in the order they were tested
1. The crew is skipping the restroom. First, because it was the client's theory and the cheapest to test. The account manager checked the night log, the restroom checklist initials for the past two weeks, and the room itself before staff had used it much: paper restocked, mirror clean, fixtures clean, floor mopped, trash emptied. She also asked the lead to send a time-stamped photo set at the end of the next two cleans. Every night was done. Eliminated as the cause, though the photo habit stayed.
2. The exhaust fan is not running. A restroom with no exhaust holds odor from the morning's use. She held a single tissue sheet against the ceiling grille with the fan switched on: the tissue pulled flat against it. The fan ran on the light switch, and the light was on all day. Eliminated.
3. The floor drain trap has dried out. A floor drain has a trap, a bend that holds water to block sewer gas from the drain line. Nothing in a restroom regularly sends water down a floor drain, and the crew's damp mopping did not wet it enough to replace what evaporated. On a dry trap, sewer gas comes straight up into the room. The tell is the character of the smell: sewer gas is a musty, rotten-egg smell strongest right at the drain, while urine odor is sharper, ammonia-like and strongest near the urinal and toilet. At 10 a.m. both were there. Kneeling at the drain, she found the sewer note strongest at the grate. With a flashlight through the grate, no water was visible where the trap seal should be.
She poured about a gallon of water slowly into the drain. Within an hour, the sewer note was gone from the drain. Confirmed as one source, not the whole answer, because the sharp smell near the urinal was unchanged. It also explained the Monday pattern: two more days without anyone wetting the drain gave the trap longer to dry.
4. Urine has soaked into the grout around the urinal. Urinal splash lands on the floor in a fan in front of the fixture and on the wall below it. Cement grout is porous, and urine that soaks in is not removed by a damp mop with a disinfectant. As the residue breaks down it releases ammonia, and it does it more as the room warms and humidity rises with use, which is the midmorning curve the client described. She got down at floor level: the sharp smell was strongest in the grout lines within about two feet of the urinal and along the base of the wall under it. A UV flashlight, used in the room with the light off and pointed at the floor rather than toward anyone's eyes, showed fluorescing patches across the grout in front of the urinal and up the wall grout under it, the pattern urine residue leaves. The grout there was also visibly darker than the rest of the floor. Confirmed as the main source.
5. The disinfectant is not getting its contact time. This was the question the client had asked, and it deserved a direct answer. The account manager asked the night lead to walk her through the fixture routine on the next shift. The tech sprayed the quat disinfectant on the urinal, the toilet and the floor around them, and wiped each within about a minute. The product's label stated a 10-minute contact time for the bacterial claims. A surface wiped dry at one minute has been cleaned, but it has not been disinfected to the label's claim, and odor-causing bacteria in the film left on the urinal lip, the toilet rim and the floor around both survive to work through the next day. The quat solution strength, checked with a test strip as in 'How to Mix Quat Disinfectant and Check It with a Test Strip', was within the label's range. Confirmed as a contributing source. The product was right; the method was not. See related: 'Disinfectant Contact Time Verification'.
Three causes, one smell
The office was smelling three things layered at midmorning: sewer gas from a dry floor drain trap, ammonia from urine residue in porous grout, and a fixture film that was cleaned nightly but not disinfected to label. Each alone would have produced a weaker version of the complaint. Treating any one alone would have made the restroom a little better and left the client still convinced the crew was not doing its job.
The fixes, matched to each cause
The drain: prime it, and ask the plumber about a primer. The night crew's restroom checklist got a new line: pour about a gallon of water slowly into the floor drain once a week, on Friday night, so the trap is full going into the weekend. That is a stopgap, and the account manager said so in writing to the office manager. Many floor drains in commercial restrooms are fitted with a trap primer, a device that adds a little water to the trap automatically, and whether one exists here, is working, or can be added is a plumbing question. She routed it to the building's plumber through the office manager, since plumbing work on the drain is a licensed trade where the state or locality licenses it, and the cleaning crew does not open, adjust or bypass anything in the drain line.
The grout: deep clean it, then seal it. On a Friday night with the weekend for drying, the lead deep-cleaned the grout in front of the urinal and along the wall below it. The method belongs to 'Bathroom Grout Deep Cleaning'; what mattered here was the product and the order. An enzyme cleaner made for urine residue, at its label dilution, was applied to saturate the stained grout, agitated with a stiff grout brush, and left for the dwell on its label. Enzyme products work by digesting the residue, and a disinfectant applied over them before their dwell is done stops that work, so that night the disinfecting pass on the floor was skipped in the treated area and done only on the fixtures. The lead rinsed and extracted the area with a wet vacuum after the dwell. Gloves and eye protection went on for the enzyme product and the brushing, per its SDS. On the next visit, after the grout had dried for the full weekend, it was sealed with a penetrating grout sealer as in 'How to Seal Grout After a Tile and Grout Restoration', so new splash sits on the surface where the nightly mop can reach it.
The fixtures: change the method, not the product. The routine became: clean the urinal and toilet first with the cleaner the kit clears for them, then apply the disinfectant per its label and leave it wet for the 10-minute contact time while the tech restocks paper and cleans the sink and mirror, then return and wipe. If a surface dries before ten minutes, it gets re-applied to stay wet. The tech's sequence lost no time; the wait is filled with the rest of the room. The lead added "fixtures disinfected, 10 min wet, time started and finished" to the restroom checklist so it could be audited.
How it was confirmed
The account manager checked the restroom at 10 a.m. on five consecutive business days after the grout was sealed, and asked the office manager to note any complaints. Days one through five: no sewer note at the drain, no ammonia at floor level near the urinal. The office manager reported the restroom smelled fine on the Monday, the day it had been worst.
Then it partly came back. About three weeks later the Monday smell returned, faint and musty, at the drain only. The plumber had inspected in the meantime and reported that the drain had no trap primer, and adding one was a quote the building owner had not yet approved. The weekly Friday priming had been skipped the previous Friday because a substitute tech worked the shift and the line had been added to the checklist but not to the substitute's briefing. The trap had dried over a three-day weekend. The fix was a briefing line for any substitute on this account and a Wednesday priming in addition to Friday until the building owner decided on the primer. The urinal smell did not return, which confirmed the grout treatment had worked independently of the drain.
What made this hard
The room looked clean, which ruled out the wrong suspect too early in the client's mind. A clean-looking restroom with an odor points away from the crew and toward the room, but the client read it the opposite way. Testing the crew first, with photos the client could see, bought the time to find the real sources.
One smell was really three. The gallon of water down the drain fixed part of it visibly within an hour, and a less careful check would have stopped there and promised the client it was solved. Smelling at the drain and at the urinal separately, at floor level, is what showed the second source.
The disinfectant question had a real answer. The client was partly right: the crew was disinfecting every night by intention and not by the label. Saying so plainly, and showing the new timed routine, is what kept the account.
References
- See related: 'Disinfectant Contact Time Verification'
- See related: 'Bathroom Grout Deep Cleaning'
- See related: 'How to Seal Grout After a Tile and Grout Restoration'
- See related: 'How to Mix Quat Disinfectant and Check It with a Test Strip'
- See related: 'Reading an EPA-Registered Disinfectant Label'