It is gross what we've done on LOTs of skulls.... after taking all the photos and measurements.. etc...... I place entire head in a garbage bag... then stuff that in feed bags for LAYERS of scent ... "control". then place head/bag in high place to protect from coyotes and stray dogs. After some time... after hunting season... a couple of months... when no foul smells are coming from bag, I remove bags and if any thing is left on skull - usually a gentle shake is all it takes to remove. I wash skull really well and allow to air out before bringing inside.

I have a buddy that placed his on an ant nest/hill and covered with drum. (He put heavy weight on top of drum to keep critters out).
He claims the ants cleaned the bones for him, I haven't seen the finished product.

Good luck.

I have a buddy that does my skull mounts. He removes the skin and major muscle components, then simmers it, then goes to work on it with a pressure washer and gets the skull squeaky clean.