New Hydra-Clean air-operated pressure washers from Graco can be used with cold or hot water, up to 200 degrees, as well as with detergent or chemical solutions. Supporting multiple guns each, three model sizes are available, offering a choice of 12:1, 23:1 and 30:1 ratio units with maximum fluid pressures of 1,250, 2,275 and 3,065 pounds per square inch respectively. Flow rates of the three sprayers range from 6.8 to 9.2 gallons per minute.