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Earn 2X Loyalty Points through 12/9 ✌️ Free reusable tote with orders $125+
Earn 2X Loyalty Points through 12/9 ✌️ Free reusable tote with orders $125+

D/2 Biological Solution - 1 Quart (Spray Bottle)

Original price $18.95 - Original price $18.95
Original price
$18.95 - $18.95
Current price $18.95

Size: 1 Quart
Reusable spray bottle

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
  • What is D/2 biological solution made of?

    Unfortunately, the exact recipe of D/2 is proprietary information. The solution is made using quaternary ammonias, and has a basic pH.
    Here is a link to the SDS and other informational material.

  • What are the shipping charges for a quart of D2 biological solution to California?

    About $9-12. If you add the product to your cart and go to checkout you will be given all the shipping options and costs before paying.

  • Can this work on a slate headstone?

    Yes, the D/2 works on all stone surfaces!

  • Will this cleaning solution remove hard water on headstones?

    No, D/2 will not remove hard water staining.
    For cleaning hard water staining from granite we recommend Sparks Brick & Tile Cleaner.
    For cleaning hard water staining from marble we recommend Akemi Marble Rust Remover.

  • Will this cleaner also remove hard water build up on headstones?

    Hello! We now offer a product called CleanStone for hardwater staining on headstones. We also offer a CleanStone Kit that comes with Sparks Brick & Tile Cleaner for maximum effect.

  • Is that a Tampico or Tampafil brush used in the video for cleaning the gravestone?

    The brush used in the video is Tampico

  • Will this work on black mold that we’re finding on some of the older headstones especially on the east coast?

    Yes, D/2 is perfect for this application! You can spray and walk away, or spray the surface and wait 10-15 minutes and scrub with a soft bristle brush. If you choose the scrub method you should rinse the stone with water when you are finished. D/2 will continue to work over time to clean the stone, so make sure you check back in 1-2 months to see the full effect!

  • How many sq inches will a quart bottle clean?

    The D/2 Biological Solution website says "Typical coverage to remove medium deposits will vary from 250 to 350 square feet per gallon."
    This means a quart will cover 62.5 to 87.5 square feet. There is a range because it depends on the porosity of the stone.

  • Is this safe to use on my brothers bronze headstone? Any suggestions are greatly appreciated. Thank you.

    D/2 is safe to use on bronze and will not harm it! The solution may not clean everything on bronze, in which case we recommend using Pre-Lim to clean and Renaissance Wax to maintain bronze plaques and headstones.

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