Effectively clean up moss, mould, mildew and algae without any scrubbing. Simply spray Wet and Forget Ready-To-Use on, and forget it. This product comes premixed with an easy-to-use trigger sprayer to treat virtually any small outdoor surface. The attached sprayer reaches up to 10 ft high, providing better and faster coverage at any angle. One bottle will cover 60-180 square feet, depending on the porosity and severity of the staining. The premixed formula is bleach free and phosphate free.