Boil the skull in a water & laundry detergent mix. I used Arm & Hammer because of the borax in it. With antlers you have to keep them out of the water or they fall off. After you get all the flesh off, besure and check the nasal area, wipe the skull down with 20% hydrogen peroxide(wear gloves & eye protection) and sun dry to get it nice and white. A beauty supply shop will have the peroxide, be sure you don't leave this stuff in reach of kids as it is bad mojo and will definately have an adverse outcome on anything it gets on. Outdoors is a good recommendation.
Mil Dot