Stinky Antlers
First make sure that all of the tissue is gone and there in nothing but bone. Antlers are made of bone and they grow extremely fast. I put mine skull in a pot and fill it with water so the skull but not the antlers are submerged and bring it to a boil, boil for 5-10 minutes, this works very well for me but the important part is the hair and all other tissue must be romoved.
Best of luck.