I got my first shaving brush last November and love using it. My question is, should I be doing something to sterilize it every few months? It occurred to me that you are rubbing it next to your face every other day. Even coated in shaving soap/cream it's bound to still be picking up oils and dirt that may not fully wash away when you wash it off when finished. Sounds like it could be a long term bacteria hazard to me. Any thoughts or tips on how to sterilize it?