You might think that don't have much use for a power washer, but once you try one you'll find that they come in pretty handy. A power washer shoots high pressure water from a hose nozzle to get things clean. It is used to remove dirt, dust, mud, grime and mold from many types of surfaces and objects like concrete roads, vehicles and the sides of buildings. You definitely need a power washer if you own a large house or a garden.