I guess Namibia does it remarkably different than RSA, or just more careful. On the place I was at in Namibia they macerated the skull at the farm first to clean it of all the flesh. Basically they placed it in a tub of water and let bacterial action strip the meat off. The horns were then taken off and then they used high percentage hydrogen peroxide to bleach the skull. This was before they sent it to dip&pack or the taxidermy of my choice. They salted the hides there too so really if I wanted it all shipped nothing further needed to be done since the skulls were clean of all flesh, etc.and hides were 'Hard-Dried or Flint-Dried' according to the USDA requirements at that point (Table 3-10-4 in the USDA Animal Products Manual available online). I talked the taxidermies there and if the farm hadn't done that they had tanks to do the same, then hydrogen peroxide and finally degrease with a detergent of some kind for skulls being mounted. Because of it's oxixizing action I have heard of hydrogen peroxide drying out horns and skulls if not used properly and I could see horns getting damaged if left soaking too long in the water and then dried too fast and/or in the sun. I will have to do some more chatting in RSA for my next trip.