Boil some water with a little household bleach and salt in it. Then continually pour this boiling water over the skull plate to loosen any soft meat or tissue that can't be removed from it dry. If you try to boil it all together you take a chance at over softening the skull plate and it may wind up bowing or breaking in the middle. Take your time and clean as well as possible. When your done spray it down with Lysol to kill any germs or bacteria and mount it to your board of choice or one of the inexpensive mounts sold at Wal-Mart and such.
If you don't understand the technology which you depend on, you will soon be a victim of that technology.