Scrub doesnt mean using an actual wood treatment on the wood. Hes talking about handling the wood correctly from the time it is cut. After you cut any wood that is intended for bowbuilding the ends should be sealed with shellac, wax, polyurethane, paint or anything that will keep the moisture from escaping too quickly from the ends and causing it to split. With whitewoods, I cut it, seal the ends with shellac, split it into quarters or halves depending on how big the log is, peel the bark and seal the back with shellac. With osage or black locust, I cut it, seal the ends with shellac and split it and then let it sit for a year or so. If you peel the bark from a fresh cut osage or black locust log you need to take the sapwood off at the same time or it will crack all over the place, learned that the hard way. You really should check out Georges website that he posted earlier, it has tons of great info on it.