I let the bugs do the work and then clean up the skull afterwards. These turned out pretty nice.
Shot this buck in November. Here's the skull after digging it up:
Then I scrub with a sponge, let it dry, and then paint and add acrylic clear coat. Also did a buck I shot back in 2012 that was mostly done, but pretty dirty:
My wife makes me keep them in garage, but the garage will have a couple of nice euros to add to collection.