I have no exhaust fan in my bathroom. I try to avoid long periods of steam and vapors trapped in the bathroom without a window or door ajar. I used Concorbium to try to remove the mold stains from popcorn ceiling. I did not test the spots to verifty it is mold. Do you guys have any thoughts other than installing an exhaust fan. What can I do other than Concorbium as it didn’t work too well either.