Power Wash Gravity Sprayer ? Now get all the benefits of Power Wash together with Gravity Spray Technology. This system delivers an ultra fine mist that distributes evenly across the entire plant surface. Squeezing the trigger pressurizes the entire bottle for continuous 360 application. Use Power Wash at any stage throughout Grow and Bloom cycles, up to and including the day of harvest. Power Wash is the cleanest ? and now easiest ? solution for your garden.