Soaking the snake in luke warm water with a hint of soap for 30 minutes is a start. You should invest in provent-a-mite and spray your enclosure WITHOUT the snake inside letting it dry out. You should also spray the snake down with reptile relief to kill the mites on the snake. Make sure to also stick to paper towels as substrate for a few weeks if not a few months. It'd also help to bake all wooden things you have and bleach anything that can't be baked.