The flesh should be soft enough after a few hours in the pan so it should come apart nicely with the pressure washer. I do recommend protective clothing as this can be messy. I use the plasterers bath for carcasse carriage for this;
The end result is blasted apart skull but to get there takes time;
Now with it being long grass and sheep shearing season I recommend you get the tick pliers out and also look for errant grass seed.
You need O Tom Tick removers available here