With the DI Accessories Featherweight Foam Cannon and a pressure washer  you will be able to apply a thick layer of shampoo to the surface quickly and easily! Just fill the reservoir with any shampoo  connect it to your pressure washer and spray a thick layer of soap onto the surface! Once applied  the foam will encapsulate contaminants  breaking them down and loosening them from the surface for a safe  scratch-free wash process