That's called cold water maceration and is the absolute best way to preserve bone and what the museums use. The best way to go about it is to remove the hide and as much flesh as possible, especially the tongue and such. Eyeballs helpful to remove also. Then you need a source of bacterially active water. You can use tap water and just wait, but it will take longer. Using pond/swamp/ditch water works best. Buy a cheap fish tank heater from Petco or whatever. The cleaner way is to make kind of a double boiler system with a plastic Rubbermaid tub inside of a cooler or another Rubbermaid tub. The heater goes in the bottom water source, the head goes inside the inner tub of water. This keeps your heater and cooler cleaner. But you can just toss the heater in the cooler with the head and water and let it rip. Bacterial activity peaks around 85 degrees, and is exponentially faster than 70 degrees. You want to fix things so the actual antlers aren't in the water or they will discolor and turn dark where they are submerged. It's gonna stink, BAD. Animals will mess with it if you let em. After two weeks, drain off half the water into a bucket, pull the skull out and toss all the junk in the bottom. The lower jaw may have detached so save it if you want it. Teeth may be another concern, especially if you left it for a little too long. Usually the process is only about half way complete at this point. The water you saved is now your inoculate for round two. Rinse the skull and pull off and easy meat, put it back in the cooler, add the water you saved, and add fresh water(rain water, pond water, non chlorinated) to replace the half you poured off and bring the level back to the base of the antlers. Let it ride another two weeks. Take it out and spray it off. Use a brush to remove any remaining meat. If it needs more time, give it another week. Everything should come off easily. You may need a wire hook to clean the brain cavity out. You use a screwdriver to pop out the ear bones. Give it a good soak in regular peroxide for a day or two. Again not soaking the antler bases at all. You can use a paper towel over the top of the skull the keep it soaked with peroxide. Add a plaque and hang it up.