When you guys are going back and forth between degreasing (dawn, ammonia, acetone, etc) and peroxide solution how long do leave a skull in the peroxide to help loosen the grease? I just don't want to leave it in for too long and have it damage the bone. I'm curently using about a 50/50 mix of room temperature BO and water to help with degreasing. I always let the skull completely dry if I'm putting it back in acetone and when I go back into the peroxide. When I take it out of the peroxide and put it in a bucket of hot tap water, the "peroixde boil" really helps get the grease out but I don't want to do it too many times and end up with a damaged skull. Thanks!!