Stanley Pressure Washer Detergent, designed specifically for washing Siding and Deck Detergent STCTW004. Do NOT allow to dry. High pressure rinse thoroughly from the bottom of the surface to the top. Apply the solution to the surface to be cleaned from bottom to top. This 1 Gallon (3.785 L) solution can be mixed at a ratio of 1:16, making a total of 16 gallons of cleanliness.