Cold-water is ideal for cleaning dirt and grime off surfaces. From concrete driveways to metal vehicles. If you need to clean surfaces coated with dirt and mud, a cold-water wash is perfect for rinsing away that grime. Cold-water pressure washing can spray away soil without the extra expense of hot-water washing. Also, cold water is preferred for some surfaces like wood or plastics that may warp under high temperatures, this makes a cold water pressure washer one of the best ways to power wash decks, siding, and even cars and boats.