Difficult roommate... and you can't tell them?

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I have a problem. I have 6 roommates, and 1 of them is just... ugh... should I say incorrigible (is that a word we use towards human)? My problem, or should I say our problem, is his way of using the bathroom. Every day, for the the last few weeks, I would need to wipe the bathroom floor dry twice, sometimes even thrice. We couldn't figure out how the bathroom floor literally gets swamped with water and an impossible amount of hair (seriously, where does he get those hair on a daily basis?). I know it's the bathroom, but we do have a bath tub, so everything wet can be, well, contained in the tub. And honestly, I don't care how he takes a bath for as long as he keeps the floor dry so I wouldn't have to dry them everytime. At first, my intention when cleaning the bathroom is that so that the next person who's going to use it would find it clean and tidy. Now, my only intention is to keep it clean so when I use it, it is clean. Unfortunately, this person uses it. In the morning before I take a bath, it is wet. When I come home from work, it is wet again. And it is always me who keeps drying it. Others feel icky about it they don't want to do it themselves. At first it was understandable, because he said that he thought someone was paid to clean it, but then we clarified that it was among us, his roommates who keeps it clean. But then, the behavior didn't stop, as if he wasn't told. My challenge is keeping my cool and not bursting in rage when I tell him about it. None of my other roommates wants to talk to him about it. Ugh! Do you have a difficult roommate you can't manage?