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 may employ UV markers to ensure staff have cleaned toilets properly and assess their cleanliness. The marker used in this context is a non-toxic, water-soluble lotion that can be easily removed with soap and water solutions. Typically, the UV marker is applied beneath the toilet seat and remains invisible under regular room lighting.