I don't know what hornaddiction uses, but many years ago Outdoorlife had a recipe I have used with excellent results. First you need 40 percent peroxide. This is only available at beauty supply stores. Get some whitener while you are there. It is actually powdered bleach. Mix it up to the consistency of whipped cream. Coat the entire skull (keep it off the antlers), and put it in a clear plastic bag. Seal the bag as best you can. IMPORTANT- set the skull on a bright white surface in the sun for a couple of days. The skulls I have done come out snow white. A thorough cleaning job will also help. The car wash works pretty good. mtmuley