Tough enough to strip latex and oil semi-transparent and solid color stains from vertical and horizontal surfaces including decks, railing, siding, and fences. Thickened formula clings to vertical surfaces. Does not contain bleach. Normally works in 20 to 30 minutes. When finish begins to lift from the wood, scrub with a stiff bristle brush. Rinse with large amounts of tap water using a garden hose or a pressure washer. Wet plants and shrubs and protect glass. 1 gallon will strip approximately 100 to 125 sq. ft. Clean up tools with water. Gallon.