So I am in the middle of doing my first euro mount and I had to complicate it by doing it to pronghorn scull.
During the second boil, the horns popped off which freaked me out until I looked up that with horned animals you are supposed to take the horn off. I pulled out the membrane in the horns but how much more is in there to clean up it was all still soft and I did not want to randomly dig around and ruin something.
Also is a pressure washer the only real way to get the brain cavity clean scooping is annoying and I don't really trust that the cavity is clean with scooping
Just a garden hose with a sprayer is fine to clean the brain and nasal cavity.
Avoid a full rapid boil and just use a low simmer so as not to weaken and separate the bone.
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Remove as much tissue out of the horns as you possibly can. After the head and horns are dry you can reattach horns using caulking
Pressure washer would be too hard on an antelope skull. Could really damage it. Tap pressure is lots enough. You just have to be persistent with dental picks or whatever you are using in the brain cavity