We don't think you should have to “nuke” something with dangerous chemicals to clean it. A sensible, smart cleaner contains ingredients that work together in perfect timing to produce the clean you're looking for. This approach defines the chemistry behind the proprietary MiracleMist “2-stage” Cleaner. How does it work? The first stage is a complex detergent package that instantly lifts years of dirt, grime, mold, mildew, and algae to the surface. When these contaminants reach the surface, the second stage, a light bleach solution, instantly removes the discoloration. This approach has created the best mold & mildew stain remover on the market.