hahaha thats funny. kids do the darnedest things. id say just wipe most of it off with a towel, then give the bike a good wash and wax? ive never had that problem though... i know when i was little, just the fact that my dad was mad at me was punishment enough. id just tell him not to go into the shop when you arent with him, and leave it at that. live and learn. besides, he was just trying to help you out