Sounds awful!I haven't had to deal with mites in many years, & then only on 2 newly acquired snakes, & the mites went no further. (I had a house-FULL of snakes at the time- but there's an advantage to not housing snakes so close together in racks.
) Anyway, good luck. I know some here have used Frontline with good effects- but can't promise they'll see & respond to your post quickly enough.
In the link I gave you, there IS a link within at the top for using FRONTLINE- it may answer your question?