I recently bought a roe buck skull of eBay, but I noticed that there was a considerable amount of dried flesh at the back of the skull and inside the the cranial cavity. It's perfectly clean other than that, though I don't know if it has been whitened with peroxide or degreased. Some pictures of it can be found here. It's a nice skull, so I don't want to damage it, but it doesn't smell particularly wonderful around the areas I mentioned. Any clues on how to clean it without damaging anything?