lockable bathroom door....

I've had multiple talks with all the kids & parents about it. I'm not completely sure a sign would work. A locked door however is 100% effective. It's not just kids either. Had some adults stay in it while visiting over the winter & it was used then but not flushed which left me a nice moldy surprise this spring when I went to de-winterize the camper. A lock on the door solves a lot of issues. The next step is no one is allowed in my camper. I really don't want to do that & be like that but I'm getting fairly tired of cleaning up after people & have them treat my camper like it's their rental. Last hunting season someone left 2 cans of 7 up in the storage under the fridge which froze & burst. Found those this spring when I opened that storage & saw mold in the carpet. I looked under there when I winterized it but they had rolled to the back & i didn't see them. Wasn't expecting soda to be in there in the first place because we don't use that storage. Just a lot of little things that bother me. This bathroom situation is easily solved with a lock. Other behaviors have already been addressed with my buddies. I told them I don't want to be the bad guy here but I also don't want my camper trashed. I spent a lot of money on it (for us) & I want to keep it nice.