1) Empty your enclosure.
2) Sanitize everything with hot water and bleach/dish soap.
3) Soak your snake for 20 minutes in warm water with a few drops of dish soap.
4) Put your enclosure back together: use paper towel substrate and keep the set up very minimal (only hide and water dish)
5) Put your snake back.
6) Get Provent-a-Mite (PAM) or Nix Lice spray to treat.
7) Repeat steps 1-5 daily until you can get the PAM or Nix.