It's getting to be the time to winterize the power washer. You buy premade mixes to run thru the pump. My favorite is shop made. Combine RV antifreeze, and mineral oil, shake well, and run thru pump. I use about 25% mineral oil, and the rest is RV antifreeze. The first time I did this, I bought a bottle of "Pump Saver" from Northern. Now I just refill bottle with shop made mixture. Mineral oil is sold as a laxative. Don't have to worry, as it's "food grade."