All-purpose exterior cleaner has a concentrated formula that cleans the exterior surfaces of your house without the need for potentially damaging pressure washing or brushing techniques. In fact, no rinsing is required. Just let mother nature do the rinsing for you. Its non-corrosive, non-caustic, non-acidic formula is bio-degradable, eco-friendly and is designed to penetrate and dissolve stains caused by mildew, mold, algae, moss and lichen from all exterior surfaces such as all types of roofs, shutters, siding, decking, fences and more.