I've never heard of using beetles, you can usally smell it if taxidemist cut corners. I do it myself all you need is a pot big enough to submerge the whole skull in and some sort of burner. Use "Arm & Hammer" super wash baking soda laundry soap. Bring water and soap to a roiling boil and throw it in, don't rest the antlers on the pot edge put something to insulate from the heat. Pull it out and start peeling of the junk when it softens up, will take several times. Gotta fish out the brain with a peice of wire or something. When you get it pretty clean start powerwashing it when you pull it out. dont overheat it or leave it in to long the skull will come apart then. Thats how I do it, it stinks bad doing it but the end result doesn't and saves you some money.