I had a similar problem when I brought my burm home. :/ He was covered.

I soaked him for an hour+ every ten days while I PAM-ed his enclosure. (provent-a-mite, btw ;] hehe) It has worked like a charm after a few sessions. I have reptile spray/relief as well, but my snake is a snarky one and liked to bite me when I tried to paper towel it unto him, lol. <3

It works as well, though. :] I've used it with my balls cause they're a whole lot nicer than Mister Burm.