If you're near a dairy farm or any place that uses a "Trench Silo" I have a friend that buries cow & deer skulls in the pile in the Winter for a couple months & it leaves them clean enough that they can be electroplated with chrome for folks that like a modern touch. Hope it helps! I think some people cook them for extended periods of time.
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Potassium hydroxide might clean them up nicely, but it's not going to whiten them any more than that.
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