My snake has had mites before and because I didn't have anything else, I
used cat/dog flea "DIP" in the proper concentration and it worked great.
Just mix it up in a bowl or small tub...depending on size of snake and "dip"
them in for about 10 seconds and then let them out and dont dry them off.
Just put them back in their enclosure and the mites just dissappear. It
worked great but make sure you keep it off their head...it's not good to
get into their eye's/mouth/etc. I also used this same treatment on my
new iguana that was heavily infested when I got her and it once again
worked GREAT! ;-)