I've used both Nix and vapona. I'm 100% sold on nix. It's way too easy and much safer. Faster too. Take a 1L spray bottle squirt in about a loonie size amount of nix into the bottom of the bottle. Add warm water and shake.
Place the snake inside a rubbermaid and spray it down, face, vent every where. Let is swim in there for a while.
Truf every thing in the cage. Spray the cage and all around, under, on top, behind, everywhere. Put in some newspaper and plastic hide boxes. Place the snake back into the cage. Do not rinse off the nix. Keep the water bowl out for 24hrs too.
In 7 days repeate. If you have other snakes and cages just assum they are infested too and treat them all.