11 years old, peeing in his pants..

Could you try to make it "mandatory" that when he comes home from school, he immediately showers, puts on clean clothing, uses deoderant (hopefully it will carry over to the next day) and then do homework before he is allowe do to fun stuff like play outside, watch tv, video games? If you did it right after school before he had time to have fun then it might motivate him (rather than trying to do it in the morning when everyone is frazzled getting out of the house). You could just make it very matter of fact and not a fight. You do X, Y,Z for hygiene and you get to watch 30 minutes of TV or video games or whatever it is he likes. Don't nag, don't fight just simply let him choose to do it and get what he wants to do or not do it and go sit alone somewhere until he does it. I like the pull-ups idea too esp since it wasn't done as punishment but as a simple plan to address a problem.