SIMMER slowly in a pot of water. Do this OUTSIDE! Take out occasionally and remove any meat possible. Repeat until all flesh is gone. Get some 40% peroxide from the beauty salon, it is a two part mixture. Do not use household bleach. If left in too long it will deteriorate the bone. Mix the peroxide into a paste and cover all parts of the skull you want bleached. Cover this in plastic wrap to prevent it from drying out. I usually leave it for a day or two. Afterward, place in the sun for a few days or more to dry and whiten even more.