When using a pressure washer, only use detergents that are specifically designed for the machine. Regular detergents, such as dish detergent, can damage a pressure washer.
Most home-improvement stores carry a selection of pressure-washer detergents. When choosing a detergent, look for a variety that suits the task. For instance, when cleaning the exterior of a home, use a detergent that is designed for use on wood or vinyl siding, while vehicle wash is an effective option for washing automobiles without damaging paint. All-purpose or general detergents can be used for any task. Concentrated-detergent packets are an option for pressure washers and are used in the same way as traditional detergents. Soap is also available for pressure washers. Soap is generally an all-purpose product that can be used for a wide range of tasks.