My roomates family is messing up my bathroom. Not clean it?

You should clean in up.. I know its not your responsibility but its your bathroom and there not going to do it.. i would talk to them after you clean it and put there trash/clothes/towels in a garbage bag tell them if anything is left in there you are throwing it away.. Make sure they know your pissed about it, they will respect you and not do it again. just make sure you get your point across.. yes you love your roommate but this is your life this is where you live why wait around for someone else to pick up the trash..