I know it's probably a known fact now that maceration will degrease as well as deflesh a skull, or any bone for that matter. I soak larger skulls (deer, wolf, etc.) in cold/unheated water overnight to help remove some blood and to keep my maceration bucket from being a bloody mess. I put this bear skull in.... and went to the hospital the next day and ended up unable to touch anything dead for a little over a week. So my bear went from "overnight soak" to "cold water maceration" which is hardly ideal... worse yet, some of the water evaporated! However... it left a very cool "waterline" that shows just how effective maceration can be at degreasing: The front half of the skull was tilted up in the bucket, but it still had some maceration going on for a few days... but the difference in 10 days in maceration vs. only 3-4 is astounding! He's since been moved to warm water maceration, though I doubt he'll even be in there until the weekend.