Our fast-acting, heavy-duty formula eliminates mold, moss, mildew, algae, and lichens while helping to prevent them from returning. This concentrated formula works without pressure washing, scrubbing, or rinsing to break down mold, moss, mildew, lichen, and algae deep down at its source with our easy-to-use mix and spray formula that’s free from bleach and non-acidic. M3C is suitable for any outdoor hard surface, including pavers, concrete, brick, shingles, asphalt, and wood, for great-looking outdoor spaces all year round.