Krud Kutter Pressure Washer Conc Multi-Purpose Cleaner gallon. This ready to use, commercial strength formula, multi-purpose cleaner is recommended for all exterior siding (wood, vinyl, aluminum), roofing of all types (asphalt shingles, fiberglass shingles, cedar til), gutters, stucco, brick and cement block, masonry, concrete driveways, walkways and walls, porch screens, pool areas, engines and equipment, even RVs, patio furniture, and boats. Krud Kutter Pressure Washer Concentrate Multi-Purpose Ckeaner requires no scrubbing, just spray on and wash Off. Simply apply to the surface, leave for 3 to 5 minutes, and wash off. This product contains anti-corrosive agents to safeguard pressure washer parts (bleach can erode O-rings). It penetrates and helps remove tough stains from dirt, oil, grease, bird droppings, tree sap, mold and mildew. It contains no bleach or ammonia. One gallon of concentrate will clean up to 2,000 square feet.