BOILING WILL DESTROY THE BONE!!!
DO NOT BOIL!! (Sorry guys, I've done this!!)
First, cut off as much of the flesh and skin with knives, razors, whatever.
SIMMER water, that is, get a pot of water almost to boil and keep it at that lower temp. Add LOTS of Oxi-clean, or similar oxygenating agent, available at your local market next to the other detergents. This step will take a long time, just simmer and periodically remove the gellied meat from the bone by scrapping. You'll know what I'm taking about, the oxiclean turns flesh into goo...
The brains will take a stiff wire.
You'll notice the teeth fall out if you're doing it right. Save 'em for later...
After the meat is all off, let the skull completely dry. Next, soak the skull overnight in hydrogen peroxide. You want the really strong stuff (20+%), not the brown bottle at your local pharmacy (3%). You can find it where hydroponic supplies are sold (you're local pot-head shop) or where industrial cleaning supplies are sold. If you use the weak stuff it may have to soak for significantly longer. Keep all antlers out of this stuff because it will bleach them white!
To get around this, soak the skull just up to the antler base and use gause on top of the skull and around the antler base to soak up the Hydrogen peroxide and bleach those parts.
When the skull is bleached to your satisfaction, let it dry again. Don't worry if some of the bone looks pinkish while wet with the hydrogen peroxide, it will dry white. Next glue the teeth that fell out in, and finish the job with a few coats of clear table top epoxy. The results are professional and stunning!
GOOD LUCK