Iv had 1 mite outbreak and was right after we picked one of our hatchlings up. But we treated her with luke-warm water and betadine solution (enough to make the water a very light tea color. We bathed her in it once a week for 3 weeks and kept her in a tupperware with PAPER TOWELS as which was menioned earlier (so you can see the mites as they fall off) . That worked like a charm and never had a single problem after.
HOWEVER, I was told that using betadine is more than OK to use to treat mites, but using it on hatchlings is not recommended (adults is more ok) due to them gaining a resistance to the medicine at a young age. So, we were told to use Listerin ALCOHOL FREE and do a water / listerine mix (not sure the solution, think its like 1tsp listerine / 1 gallon for adults, but im not 100% sure) . I have not used the Listerine yet b/c I have only had 1 outbreak and nothing since, but have heard NUMEROUS people saying the Listerine worked like a charm and was not harmful in anyway to the snakes, regardless of drinking it.
But the mites come from a dirty environment, so make sure the snake gets a bath, the cage and EVERY piece of housing in the cage gets a bath and keep them isolated for a bit with some paper towels as substrate and you should be ok. Mites suck to have, but if you treat them quickly enough and take the right steps everything will be A-OK.