I have used pressure washers of most makes and models ever made for years. I have used a fleshing knife very little. I am surgical with my washer and its a big old bad boy. The nozzel is the key. A #0 or straight stream will ruin a hide like a 22 auto. I have tried this with great success using a swivel, aka, an impact nozz that spins at very high speed and pressure. It will clean anything. It can also destroy. Anytime you really USE a washer, you will get wet and messy. But, I get messy trying to flesh tough hides and end up washing the hides anyway. In central AR, we don't get much really cold weather. Spoilage is a far greater problem for me than freeze up. I use a 15 degree fan nozz for cleanup. Tack or staple the hide to a board to keep it off the ground and out of the mess. I can do 3 beavs before I can get my knife out. The hides look great. My partner uses an old chainsaw bar to scrape his hides, and he's quick and good at it. Bottom line is what you have avaiable to use, and what you can do with what you have...LOL