You have to be very careful using a power washer JW. The inner nasal area is very delicate and if you get too close to the skull with the wand you can blow those pieces to bits with the pressure that most places use. The best thing IMHO is to just use one to wash out the initial brain and loose material. Then simmer the skull for quite a few hours while taking it out of the pot to scrape all the material that the simmering loosens up. Then you finish with a whitening agent like peroxide. It takes some time and patience, but is one way to pass the time if you have nothing else going on during the winter. Here is the last mule deer buck I shot out in Wyoming in 2015.