What is the trick with the power washer?...I have used my power washer to remove bark from cedar..makes pretty logs...probably something along those lines?
after your first salting you can give it a shot, pretty much the same way with your bark removeing idea, but you gotta be careful not to use one that will cut the hide. my power washer has a tip that sprays pretty solid and wide and should not cut the hide (similiar to the one the taxidermest was using), i have yet to really try...weather... it's just finding the right tip to do the job and you should be set.
we were power washing off some of our deer skulls for mounts and my friend got a new power washer and one the tips will cut a deers nose area OFF and put a small grove into a deer skull, cut into a boot and about an 1/8" to 1/16" gash into plywood, wanna know how i know so i will say a tip like that is a no go.