Zep, 128 OZ, Deck & Fence Wash, Helps Remove Dirt & Stains Cause By Algae, Mold & Mildew On Fences, Wood Decks, Shake Shingles & Other Wood Surfaces, Concentrated Liquid Formula Helps Clean, Brighten & Prepare Wood For Staining Or Painting, Use With Pressure Washing Equipment, Makes 20 Gallons.