I got this skull as sort of a gift from a hunter who doesn't have enough time to finish it. The bits of flesh on it are so dry they don't give at all and crack when I go at them with pliers. How do I go about that? I am also curious about the dark brown/ black stuff on the inside and the thin porous walls in the canals seen from inside the skull. They hold a lot of residue, should I break through them with something? (I attempted to add three photos, not sure if it will work.) If I manage to clean it up, then I plan to whiten and mount it on a wooden plaque.