So with alot of help from my B.I.L I have my bison skull this far. From my understanding I need to take the sheaths off??? How do I get them off? We have been using a pressure washer with boiling hot water around the bases. Then leaving it overnight in a heated shop to try and loosen them up. We beat on them a bit but I'm scared to break something. Do I need to take these off??? Or will I answer my own question in a few days if I bring it in the house. I'm going to give it another round of peroxide as well.