I got a whitetail skull from a friend about a week back. The skull was clean, had no weird scents, and had no dirty bits. The only issue was that it was very, very, yellow. I put it in some hydrogen peroxide for a day, and imagine my surprise when it comes out looking like this: Very dark below the eye, spots of grease everywhere. I got a tip to put the skull in some water with some Dawn dish soap and leave it for about a week to get the grease off, so that's what I went about doing. Today was the 7th day of degreasing, and I take the skull out to see that it's taken on a bumpy texture, and if possible, has become yellower and a bit more worn: Any ideas of what's happened or how to fix it? I'm not about to do anything else with this skull until I know what's going on here!