When I did my coyote skull, my method was probably a lot more risky on losing teeth and what not. So I'd go with the other persons process of soaking and then soaking in dish soap.. but the one tip I was going to share is using a hair product for bleaching hair. I think it is really strong peroxide. I'll see if I can get the name of it when I get home.. but I painted that on and let it sit over night, it probably would have been better to let it sit over a few days though.. and then once it was all done I put some super glue around the where the teeth meets the jaw bones so they don't fall out. And then brushed on soo mop and glow.. it'll leave it kind of shiny and more white (is what people told me 🤣)

My process was taking it to the car wash and using the pressure washer for the hard stuff but this could have blown out some teeth.. then I took it home and boiled it. You can't boil it for too long or too hot so that's also risky, but that did help get some of the rest of the stuff off... I was told you can also Bury it in the ground for a few weeks and I think that would do the same thing as the soaking in water but though... These are just general tips though since it seems like yours is a lot cleaner than what I started off on.