I put my skinned head in a black trash bag and left it in the yard for a week. The horns popped right off. I then boiled the skull. I filled the sheaths with borax and let them dry. Once dry I shook out all of the borax and used a bottle brush to get whatever else I could out. Then I sprayed clear spray paint inside. For the outside of the horns, to keep the dark color I just use WD-40.