After soaking the driftwood in bleach, just add some dechlorinator to neutralize the chlorine.All you have to do is boil it if possible, if it is larger then your pot then just put it in a container and fill it with boiling water. Let it soak for 10 mins. After give it a scrub to take of any loose pieces, then another hot water bath then into the tank after it has cooled. The bleach works as others above have noted but I'd personally be nervous about using bleach on anything being put in my tank, mostly because I don't trust myself to do it right lol