If you suspect you have mites the best way to tell is to remove all the substrate and put the snake on paper towels. This will let you see any that fall off the snake. Also look in the water bowl as your snake soaking means it's trying to drown the mites. It is safe when using the proper methods to pre-treat your enclosure for mites. I've heard of some owners doing a monthly treatment for mites and/or treating their cages whenever a new arrival is brought into the home. When you see them the mites will be very small, round bodied, and slightly red tinted. You may need to add a second water bowl with a big ball of paper towels in it to help keep your humidity up. For the real problem I recommend ordering a can of "Provent-a-Mite"(also known on the forum as PAM), it is a time tested, reptile safe, killer of mites. I have had mites twice in the last year and PAM knocked them out in just a few weeks. Don't go looking for an overnight cure of mites because if you did find it I'm sure it wouldn't be made for or safe for reptiles. Here's a link to where I purchased mine from. After some research it really was the cheapest I could find, and it's WORTH IT. I hope this helps you GOOD LUCK
http://www.pro-products.com/index.ph...d=53&Itemid=59