How sterilize Driftwood - soak the driftwood in a bathtub full of water for a couple hours. Put the driftwood in the oven, between and with the oven door either slightly open or closed until it has baked dry, hrs depending on how thick the piece is.
Use Baking Soda and Vinegar to "quick weather wood" to look much like driftwood! Remove finish on wood with ratio of baking soda and water. Spray with vinegar and let sit minutes. Then scrub it off with a brush, rinse, dry, and stain or paint it.