fill a storage tub with hot water and dawn. drop your skull in there and use an air gun under the water to "air boil" the grease out of all the crevice's Take your time and be sure to get the nasal cavity well. Apply your 40 volume bleach and whitening crème you got a Sally's beauty supply and mixed to a paste with a small brush, wrap in saran wrap and hang it over your Mr. buddy heater. Rotate it every so often to heat evenly. It should be hot enough hat when you remove the saran wrap, it's steaming. rinse of and let dry.. Don't get any on the rack!