Someone linked this video for me the last time I had a mite problem, and it's so simple to do. Re-apply the frontline to the snake after 2 weeks. Be sure to wait until the snake is completely dry before placing it back in the enclosure.
I also had PAM to spray all over nearby furniture and floors and outside the enclosures. I caught the mites really early, so I didn't find any dead bodies, but the mite issue was resolved doing both these.