Vincent,
You need a good inspection form that is used at check-in and check-out. Also you need to have a document that explains what the cleaning expectations are.
I put together these things and use them regularly with scout groups and others usnig our camp. Your user groups are going to be different, and might not take so willingly to this kind of thing.
Send me your e-mail and I will send you copies of these two documents. They might be a good starting point for you to develop something similar for your needs.
Works really well here, but it isn't something that I use to punish bad behavior as much as to encourage good behavior. It has done that without question.
Good Luck,
NICK
