It seems that I am always treating wood for my cockatiels and this is what I do (and what has been suggested to me by other cockatiel keepers).

To treat wood to kill off any mold, fungus, etc. soak it in a few gallons of water with about a tablespoon of bleach for about an hour, after that rinse it off really well (I tend to use hot water for this). Then if it is a smaller branch that can fit in your oven, bake it at about 250* for about another hour. Otherwise leave it out in direct sunlight. This is so that the wood will be dry all the way through. I imagine that if it works for cockatiels, it would work for snakes too.

For regular cleaning of wood (once you do the initial thorough cleaning), I normally just scrub it really well with a mild dish soap and hot water and then I bake it at the 250*.