How to clean mold or mildew from concrete and stone ...
· The directions for Wet and Forget say to dilute the product with 5 parts water to one part Wet and Forget, and to use a spray bottle (I used an emptied and clean Windex bottle) and spray it on a dry surface. The mold around my home was on a few surfaces – the front stairs, stone on the home, and the wall around the front of the property.