Tolly is correct thats the way I've heard it done but you can actually leave the bones in warm or cold water for a few days.A guy I know did a whole skeleton and he watered down the peroxide.About two parts peroxide to one part water,he says it takes longer but really shines up the bones.I found a skeleton in the woods last year and its still in a box in the shed,I might try to treat them this year.Also they had been there awhile so they were picked clean already.