Supervisors may use UV markers to inspect whether the staff has cleaned a toilet properly, and to rate how well the toilet has been cleaned. The marker used in this case is a lotion which is non-toxic and water-soluble, so it can easily be removed by soap and water solutions. The UV marker is usually applied to the underside of the toilet seat, and is not readily visible under regular room lighting.
Supervisors can utilize UV markers to check if staff have cleaned toilets thoroughly and to evaluate their cleanliness. The marker employed here is a non-toxic, water-soluble lotion that can be removed with soap and water solutions. Usually, the UV marker is applied beneath the toilet seat and remains hidden under normal room lighting.