Yeah provent a mite is easily the best... I used a "mite killing" spray I bought from a pet store because I couldn't wait for the provent a mite to arrive in the mail, and needless to say that spray killed the snake and the mites were still alive. Instructions on the bottle even said to spray directly on the snake... I should've known better. Spray the enclosure/tub and substrate, let it sit for a hour and you're good to go. The unfortunate thing about provent a mite is it doesn't kill all mites, like wood mites, I used to keep snakes in my basement and their cages would be FULL of little bugs crawling around. I'd wipe hundreds and hundreds of the bugs off the lids daily, change the water bowl that would full of dead bugs, and spray new substrate with provent a mite, and the next day they'd be back like they never left. So I moved the snakes a couple floors up in my house, no wood mites.
Someone needs to invent the Provent-A-Proventable-Mite.