Wet and Forget is the ultimate cleaning product for cleaning outdoors. Hardware Sales is located in the Pacific Northwest and here we get lots of rain which means lots of mold and mildew. No more having to pressure wash driveways and patios. Gone are the days zinc strips on the roof to keep moss off your shingles. Wet and Forget is a non-caustic and non-acidic solution that contains no bleach which means it will not stain your shingles or deck. In most cases it can work for up to a year with just one treatment, just mix it, spray it, and forget it. While other similar type items have a higher ph Wet and Forget has a ph of 8 which is close to water and is registered product with the EPA, which most other items are not. Wet and Forget is environmentally friendly and bio-degradable.