A pressure washer for my service truck. I bought a Grandfalls electric one that has a 100' retractable hose. It fits in one of the truck bed compartments and gravity feeds from a 30 gallon water tank. I mix a couple cups of detergent in with the water so that it cuts some of the dirt. It's so nice to be able to wash off the problem area of a machine before working on it. A case of brake cleaner lasts me months instead of weeks.