I just boil mine till the meat comes off (all the meat) take a section of wire and bend it to look like a cork screw,stick it in the hole in the back of the skull(the spinal cord opening) twist it round and round a few times to loosen the brain and then blow the brains out with the water hose.
Then soak it in a bucket of bleach water.(be sure to keep the horns outta the bleach water).
let dry and mt. on base.
thats the easy way I do it.works great.