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D/2 Biological Solution - 1 Gallon


Size: 1 Gallon

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.

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


Ask a Question
  • Will this work on a mildewed concrete patio or do you have to clean the mildew off first?

    Yes, this will work very well to remove mildew from a concrete patio!

  • Living in Colorado, we have a lot of minerals in the water. The cemetery irrigates using sprinklers which when the water dries on the monuments there is a white deposit that builds up. Will D2 work on solving that problem. If not please suggest something.

    Hello, we recommend trying the Sparks Brick & Tile Cleaner and CleanStone for this!

  • Does this remove rust from headstones? Our cemetery has so much mineral in the water the headstones look orange with rust.

    D/2 Biological Solution works to remove mold, mildew, moss, algae and air pollutants. Unfortunately, it will not work well to remove rust stains. We recommend trying Pre-Lim Surface Cleaner or Rust Remover

  • would it be safe to use D2 on the interior/exterior of a nylon tent that's covered with mildew?

    Yes. We don't know of any official testing on nylon, however it should work and remove the mold. Make sure that you thoroughly rinse the tent after application.

  • Is this safe on white quartz?

    Yes! D/2 is safe to use on all hard surfaces

  • does this item come with a the 1 qt. spray bottle?

    No, the quart size with spray nozzle is sold separate. The D/2 Gallon is just the gallon sized container of solution.

  • I have 15 S.F. of granite to clean at family cemetary - how much do I need? I see John at Brico in Glastonbury, CT from time to time.

    Average coverage is 300 square feet per gallon so 1 quart of D/2 should be more than enough!
    Click here to buy D/2 1 Quart

  • Is D2 safe to use on bronze?

    Yes, D/2 is safe to use on bronze but it will not clean oxidation.

  • Is d-2 ok to use on shingle roofs?

    Yes, D/2 is safe on all built structures and works well in most situations where biological growth is the issue.

  • If i use this product will damege the glass and a metal?

    No, D/2 Biological Solution will not damage anything that it's used on.

  • Is cleaning with D/2 best followed by rinsing with water?

    There are two primary cleaning methods when using D/2. 
    1. Spray D/2 on and walk away. It will take longer but eventually the rain will naturally rinse away the staining, it could take a few months.
    2. Spray D/2 on. Let it dwell on the surface for at least 15 minutes then scrub with soft bristle brushes and rinse with clean water. This method will give faster initial cleaning, but can still take up to a few months for the full effect.

  • What is the shelf life of D/2 one gallon unopened. Also D/2 one gallon opened. Thank you.

    The shelf life on D/2 is 5 years, opened or unopened.

  • Is it safe for plants and grass?

    Yes it is safe in environments with plants and animals.

  • Do we use the D/2 straight out of the gallon bottle or dilute it?

    For long term or stubborn staining of biological growth it will be most effective undiluted. 
    However for less aggressive biological staining, or if you're re-cleaning stones that were recently cleaned you can dilute up to 50% water.

  • Do you have to reapply the D/2 every so often or is it just a one-time application?

    After application, the D/2 will do it's best work in the weeks and months to come. Results should last at least a couple of years before another application is necessary!

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