I tried looking for the in depth post regarding spraying outside the cage to help stop them spreading but couldn't find it again . I did however find this ..
PESTICIDE - Spray the shelf and floor around the cage with Pro-vent-a-Mite or Frontline spray to kill mites in the environment. Be sure to keep the room well-ventilated so the fumes do not affect you or your reptiles.
Not sure if links are allowed but a quick Google should give you some more information. Hopefully if you contact them they can give you some help. I hope it works for you like it did me![]()