Pressure washing, also known as power washing, is a cleaning technique that involves using a high-pressure water spray to clean surfaces that have accumulated dirt, grime, or other types of debris. The equipment used in pressure washing typically consists of a high-pressure pump, a motor, and a spray wand that emits a powerful jet of water.

The pressure of the water used in pressure washing can range from 750 to 30,000 psi (pounds per square inch) depending on the application. For example, lower pressure is used for cleaning delicate surfaces such as wood or stucco, while higher pressure is used for removing tough stains like oil, grease, or paint from concrete or metal surfaces.

The cleaning process involves directing the high-pressure water stream at the surface to be cleaned at a specific angle, usually between 15 and 45 degrees. The angle of the spray helps to control the force of the water and prevent damage to the surface being cleaned.

In addition to water, pressure washing may also involve the use of cleaning solutions or detergents that are designed to break down dirt and grime and make the cleaning process more effective. These solutions are usually applied to the surface before pressure washing and allowed to sit for a few minutes to penetrate the surface.

Pressure washing can be used for a variety of applications, including cleaning buildings, sidewalks, driveways, decks, and vehicles. It is an effective and efficient method of cleaning that can save time and effort compared to traditional cleaning methods. However, it should be used with caution and only by trained professionals as the high-pressure water stream can cause injury or damage if not used properly.