Question On Restoring An Old Ram Skull

First, see if you can pull the nails out. Then submerge the entire head in a container of hot water that you have added a fair amount of dish detergent to. Dawn is a strong one. To get sheep grease to move, you are going to have to heat the water to 120 degrees 24/7. There are several ways to do this. Let that skull sit for at least a week before you try to remove the horns. You might be able to wiggle them off after a long soak. Try hitting them (hard) with a rubber mallet from side to side and they might come free. The skull has a lot of grease in it, probably boiled in, so it is going to take some time to remove it. I can't tell if that is Bondo or not.

 

Would love to see pictures once you get it apart. This is the result of boiling/simmering a skull. It might have looked nice and white originally but, after a few years, this is what happens as cooked in grease starts to surface. You might get a lot of this out but don't be surprised if you have residual stains that just won't move.

 

Maybe try to lever them up by getting the flat blade of a small screwdriver underneath and prying up? If you can get them up enough you can get a small hammer onto them and pull them out.