A power washer, also known as a pressure washer, is a cleaning device that uses high-pressure water spray to remove dirt, grime, mold, and other debris from surfaces. It typically consists of a motor, a pump, and a nozzle, which can be adjusted to control the pressure and flow of water. Power washers are commonly used for cleaning driveways, decks, patios, and vehicles. These machines can be powered by electricity or gasoline, with electric models being quieter and suitable for lighter tasks, while gas-powered models are more powerful and ideal for heavy-duty cleaning. Proper safety precautions should be taken when using a power washer, as the high-pressure water can cause injury or damage if not handled correctly.