I've never had mites, but there are some good threads on here if you do a search. Basically buy some Prevent-A-Mite, then use it with the snakes in a temporary enclosure with white paper towels as the substrate while you completely sterilize and PAM everything. I'd guess you should vacuum or mop the floor in the snake room and pam around the enclosure, too. I'm sure others will have more to say, but PAM seems to be the general fix.