While powerwashing a TimberTech deck is not the preferred way to clean, you can powerwash it on a “rinse-only” setting when the pressure is set to 1500 psi or lower, and when using a fan tip nozzle. Always keep the nozzle at a reasonable distance from the surface to prevent damage. To be safe, first try the power washer on a scrap piece or inconspicuous area of TimberTech Deck to be sure that you will not damage the surface. In some situations, power washing alone may not provide optimal results. Refer to the TimberTech Installation & Maintenance Guides.