Hi,
Sorry but I disagree with some of this.
The water in any tub like this should be about 86 degrees F - you really don't want it to be as hot as 100f at all. And if you are going to use water that deep it is really important that you supervise it constantly. But, to be honest, if the snake has been sitting in his waterbowl and there are no dead mites in that I would skip the bath alltogether.
The female mites lay the eggs away from the snake and possible even outside of the enclosure so while cleaning everything inside isn't a bad idea it certainly won't kill all the eggs. This is what makes mites such a pain you think you have got them all then 30 days later a new load hatch and you are back to square one.
If you have mites pay the $18 get Provent-A-Mite and treat the enclosure following the instructions exactly. Repeat in 30 days and your mite problem will be gone.
You don't need much of it at all so the can will last you for ages even if you treat all the enclosures as a preventative measure (which is a good idea for anyone with more than one animal who discovers they have mites ).
dr del