skin the head...cut out the tounge, neck and anything you can...dont be picky but get major stuff...

boil in water for ~8 hrs...add water as needed...can drain and add fresh water if you want

pull out, get everything off...at that point, it falls right off...use facet or hose to get nasal cavity and brain cavity clean...

let dry....peroxide and let dry....comes out nice and white....pretty much effortless, but has to boil a long time....everything rinses right off with a hose though...no nasty stuff to stink up the house for years to come...

use peroxide, not bleach...bleach will continue to eat the bone and sooner or later(much later) it will fall apart...