Spray and Forget 64 oz. Concentrate -InchNo Rinse-Inch House and Deck Cleaner makes up to 5 gallons. Works great to remove stains caused by mold, algae, moss, mildew and lichen on siding, brick, stucco, wood, decks and more. Easy to use! Simply spray it on and forget it. No rinsing is required. Eliminates high pressure rinsing. Eco-freindly and biodegradable. Non-caustic, non-acidic and non-corrosive. Contains no bleach, lye, or acid. Safe on all exterior surfaces. Algae, mold, and mildew will disappear with subsequent rainfall.