The only time I bathe my corns or balls is when they have a difficult shed (never for my corns) and/or if they covered themselves in some feces.. which has happened a couple times. -.-

You don't have to bathe them to help them go to the bathroom, my boa was constipated for a while so he needed baths to help him take care of that. Rarely happens with ball pythons though, and if it does you would know it.