For saltwater driftwood I usually just give it a good spray with a hose to wash off any debris and then throw it in the tank. From freshwater, I'd probably give it a good scrub and hose off then pour a couple jugs of boiling water over it and throw it in the tank.
Ok. I may do that then. The drift wood has also been sitting in the hot sun for a while, so a lot of stuff is probably dead. But I'll clean it just in case