If you just want to try an clean them off of the snake, there are some products that are usually available at pet stores. One is called Reptile Relief and I think the other is called Mite Off.
I still recommend ordering a can of Provent-A-Mite to have on hand in case you need it. It is used to treat the enclosure and furnishings, NOT the snake or water bowl directly. It is pretty decisive in the battle against mites...
I think Mite Off is useless. I picked up a bottle the other day, found a live mite and sprayed it, after it dried, it walked away! But today i picked up a bottle of Nix and will give that a try.