I didn't. my pieces came out of lake huron. some beached, some still submerged. quick spray with the garden hose to get the sand or mud off and in they went.
A bunch of my driftwood is Lake Ontario picks, never did anything more than hose it off on my deck before I put it in. I have a piece that has been in my tank for a year and will still float if I take the rock that's holding it down off of it