Jim's suggestion should kill the mold, and at least partially remove any stains it might have left behind. The bleach will probably also slow down the possible return of the mold, but it won't totally prevent it, unless you keep treating it.
Vinegar will kill mold and mildew (and lots of other germs), and is safer to use around your snakes than bleach is, so there is no need for all that rinsing. My recommendation would be to do the treatment Jim suggested, then use vinegar for preventative maintenance. You could probably just spray the vinegar on the wood, let it soak in a bit, give it a quick rinse, then replace it in the enclosure.