Yes this is the nastiest way to do it but it is effort free....

I have a big old ice chest that is just big enough to fit a big set of antlers in with a head attached, I just toss the head into the ice chest, prop the lid open with a small rock, just big enought to let the fly's in.... after a two days I take the rock out and shut the lid , five days later is get a GOOD set of rubber gloves and open the lid and get the VERY clean skul out and get the lower jaw out also if you need it. Then wash with water and bleach...

Smelly and gross but Very effective , turns out the cleanest skulls I have every seen new to the Dermistead beetle colony's