["It irritates me when my roommate doesn't clean up after himself", 'I hate that too! Do you make him clean it up?', "I say something and he just gets all grumbly and then it's uncomforatable."]
That's a tough situation to be in. I would just take all his belongings to the dump and be done with it. Maybe he can stay there too.
It irritates me when my roommate doesn't clean up after himself