What I do with branches is use a wire brush to remove loose bark & debris, then thoroughly spray them (turning to reach all sides & crevices) with the same diluted chlorhexidine that I use to wipe down my tanks & all. Let them thoroughly dry in hot sun if you can, & not on the ground or bugs may move in. Should be good to go after that (no rinsing needed).
Do NOT use bleach, as it soaks into the wood & the fumes remain, & they'll harm your snake. (very irritating/toxic to lungs etc)
Blowtorch? Sounds like a great way to start a bonfire...I wouldn't do that either. If you have a steam-cleaner, you could probably do that instead, though.