In addition to Black Knight I use Sawyers Tick Spray or Repel Permanone. I use the BK to "pre-treat" items that come in from the pet store. The Sawyers and Repel are used to take care of the cages.... once a month while the snakes are eating I remove the water bowl from the tank and give each tank a quick blast. Then let it air out for a 1/2 hour or more before putting the snake back in the cage. The Repel and Sawyers will leave a residue in the cages that will continue to work on mites for up to two weeks.
What ever you do DO NOT spray any of those products directly on the animal!
1.1 Columbian BCI, 1.2 Hog Island BCI, 1.0 Irian Jaya Carpet Python, 0.1 Ball Python, 0.1 Children's Python, 1.1 Amazon Tree Boa, 1.1 Dumerils Boa, 1.0 Horned Mntn Dragon, 1.0 Carolina Anole