Here is some info i read on a snake web site, hope it helps. Perhaps if you try it and it works you can let us know for future reference:
Mites and Ticks
Snakes are often afflicted by parasites, especially ticks and mites. Mites are very tiny creatures that are usually found on and under a snake’s scales, on the rims of the eyes, or around the vent. They come out of their hiding places at night and suck the blood of their host, which can cause a snake to become anemic. Mites are also thought to be disease transmitters. They can be difficult to spot, but their silvery droppings give them away, normally appearing on the snake and in other places. Mites multiply very quickly and can do significant damage to your snake’s health if left untreated.
If your corn snake has mites, place him in a covered container with shallow water for three or four hours. While he is soaking, thoroughly clean and disinfect his terrarium and everything in it. Remove the snake from the water and dry him before returning him to his terrarium.