I just bought a 21mm silvertip shavemac, and I was wondering if it's safe to use it with soaps? I'm somewhat new to soaps (well, new to using them correctly with the help of the thread from B&B) and I really don't want to pull half of the hair out of the brush using it with a soap. I know that Boar/pure badgers are supposed to be better for soaps, but would a silvertip be out of the question?