i'd be upfront and tell him to pick up and help out around the place...give him 2 weeks to shape up or ship out

i do have a big question...is he renting from you?...or from a landlord (if the latter then you do not have grounds to evict him or kick him out)

also don't pull any childish pranks...he could go postal in a reaction or call the cops if you ruin something of his (just to get back at you for kicking him out)