well then tell a manager and tell them it's disrupting yours and others ability to work at top efficiency....

if it is from dirtiness, that's not exactly sanitary either.. maybe even posing a health risk (there was a local resturant recently, one of the servers didn't wash his hands after he shit, and he was hepatitis positive, it left a huge scare, i think someone even ended up getting it, but luckily if taken soon enough, vaccines can reverse it/kill it... which they had the vaccine center open in the resturants parking lot... lol