I'm not too good with the whole human interaction thing, but for the smell I would recommed LYSOL. Prefereably unscented. Spray it on everything, then flood the room with it. Afterward, open the window if you have one. It might make a difference. Another thing I suggest is to stand next to the guy when you both are out of the dorm room. That way you can confirm the smell is coming from him. Just a thought.