You just charge for it. A dollar per entry should be enough for someone to come by and clean it twice a day, such that it doesn't matter what shenanigans antisocial people get up to in there. No mess will last longer than a few hours.
replyNot sure why you're getting downvoted. This approach has been shown to work. The money isn't for funding the maintenance though, it's strictly to keep the riff-raff out.
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