i don't bathe anymore but i used to. if you do, PLEASE DON'T TAKE YOUR EYES OFF THE SNAKE FOR A SECOND. i never had a disaster but a month or so ago 2 people lost a snake to drowning within a week of each other.
sometimes it takes a little bit. i keep the humidity right and just wait it out. do you have something he can rub off on? i keep rocks as decoration but they use them for shed too.