My first post here but I thought this was an interesting topic. I have boiled many skulls in the past. I first skin them out and remove the eyeballs and all lose meat I can. Then I take a close hanger to the brain and flush it all out. I then boil in borax changing the water every twenty minutes or so. It has been a while since I have done this but thats about the scope of it. All my mounts have turned out great also.