I've used the "old fashioned" method on my skink.
She has snake like scales, so it may work for you too.
She had LOADS of snake mites when I got her.
I would soak her in a sink full of warm water, for 15 minutes or so, then after the soak, I would dry her off with a paper towel, then coat her in a light film of vegetable oil.
I put her in minimally furnished aquarium with one disposable hide
I did this every day until I found no more live mites on her, or in her tank for two full weeks.