D/2 Biological Solution - Removes stains from mold, algae, mildew, lichens and air pollutants by D/2 Biological Solution Save Liquid error (snippets/product-badge line 32): Computation results in '-Infinity'% $18.95 1 Quart Sprayer - $18.95 1 Gallon - $45.95 1 Gallon + 1 Quart Sprayer - $61.95 2 Gallons - $89.95 4 Gallon Case (1 gallon units) - $177.95 5 Gallon Pail with Drum Faucet - $209.95 Size 1 Quart Sprayer 1 Gallon 1 Gallon + 1 Quart Sprayer 2 Gallons 4 Gallon Case (1 gallon units) 5 Gallon Pail with Drum Faucet 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart D/2 Biological Solution - Removes stains from mold, algae, mildew, lichens and air pollutants D/2 Biological Solution is a biodegradable, easy to use liquid that removes stains from mold, algae, mildew, lichens and air pollutants. It is effective on marble, granite, limestone, brownstone, travertine, masonry, terra cotta, concrete, stucco, wood, and other architectural surfaces including monuments, sculpture and headstones. A contact time of only 10 to 15 minutes followed by scrubbing with a soft nylon or natural bristle brush will loosen most biological and air pollutant staining.D/2 Biological Solution is effective for removing harmful biological and air pollutant staining from many building materials including masonry, marble, granite, limestone, brownstone, travertine, terra cotta, concrete, stucco, wood, canvas and vinyl & aluminum siding. Coverage: 250-350 square feet / gallon to remove medium staining Check out all the of the users of D/2! Including The White House, The Veterans Administration, and the Congressional Cemetery. Safety Data Sheet SPECS