To get rid of the mites on the actual snake, soak them in water with a drop of mild soap; which will suffocate the mites
You should see them build up on the sides of the tub like little pepper flakes in water
Grab something called 'Mite Off' by Zoo Med and spray the snake down with that. The mites should be gone within 24 hours
Use PAM to kill mite eggs and prevent any future outbreaks
good luck!