<< buy some condoms squirt some lotion in them and throw 3 on his bed and 3 in front of his door
then leave a note on his door saying if he doesn't clean up you'll invite his mom over again >>
<< Get a pair of rubber gloves and some super glue. While he is asleep glue his peewee to his belley so when he pees it hits him in the chin. >>
This thread is almost as hilarious as the "post your best you're still a h0m0 pics" thread.
Seriously though, we've solved the roomate problem by sheer square footage. If his room is literally 2x the size of your room, he should be paying double the rent you are, so $300 you, $600 him. That might be a bit much though, I'd say go more like $350 you, $550 him.