On a recent rare tour a regular who asked to shower immediately on arrival left a towel in such a state I had to double bag it, it was awful and I didn't know what to do. Poor hotel staff.
The towel wasnt particularly marked, although bathmat had faint brown spots on it, he left a bootprint on the bathroom floor. I noticed his clothing had a smell too as if not washed for a while. Very confused now because he's been an otherwuse good regular. Thankfully he didn't use a bathtowel only hand and the bathmat. I washed the bathmat by hand, may try that with hand towel if it happens with anyone else.