I recently bought an antler plaque and had a question about mounting them. I cleaned as much fur and skin off the skull piece as I could, but there is still some sort of membrane and a little bit of "stuff" left on it. It has a bit of a funk to it, so I don't want to stick that on my wall yet. Is there something I can do to get the rest of this stuff off? I'm sure someone out there knows. Thanks!