In this video Mark Donovan of http://www.homeadditionplus.com discusses Wet and Forget for removing moss, mold, mildew and algae off of asphalt shingle roofs, metal roofs, patios, driveways and other surfaces. He explains how to simply spray wet and forget onto the moss, mold, mildew, or algae surface and forget about it. Days later the moss, mildew and algae begin to brown up, dry out and fall off the roof or other surface.