D/2 Biological Solution is specially formulated to remove environmental pollution, dirt, and staining from biological soils such as mold, mildew, lichen, and algae from indoor and outdoor structures. Staining and soiling caused by mold, mildew, algae, lichens and air pollutants contribute significantly to the degradation and disfiguring of many types of construction surfaces. D/2 can be utilized to safely resolve this problem on all wood, stone, masonry, metal, vinyl, and roofing surfaces.


D/2 Biological Solution is used by the VA to clean over 3.5 million headstones each year. The National Cemetery Administration now uses D/2. Quote: “The NCA entered into an agreement with the National Center for Preservation Technology and Training, NPS, to evaluate marble cleaners in an effort to minimize damage to historic headstones. The 3-phase study began in 2004 and was completed in 2011. The best – practice recommendations resulted in NCA’s determination to use the preferred cleaner, D/2 Biological Solution…” (Page 3)
From Presidential Executive Order 13287, Preserve America FY 2011 Triennial Report Department of Veteran Affairs.

Landmark Sites & Buildings

D/2 can be safely used to remove dirt, soot, pollution, and biological discoloration from most masonry surfaces. Brick, concrete, granite, sandstone, marble… you name it! D/2 has been used since 1995 to clean historic masonry buildings, World Heritage Sites, and important monuments around the world, including iconic sites such as The White House, The Alamo, The New York Public Library, The city walls of San Juan, Puerto Rico, The Tomb Of The Unknowns, Washington Monument, plus many more.


Users of D/2


  • Jefferson Market Library Posted in: Museums - The Jefferson Market Branch of the New York Public Library was designed by Frederick Clark Withers and Calvert Vaux and completed in 1877. Margot Gayle, EE Cummings and Lewis Mumford lead the effort to save it in the 1960s. Giorgio Cavaglieri was then hired by the NYPL to convert from… Read More
  • MIT Building E52 Posted in: Universities - MIT Building E52 is an Art Deco limestone building dating back to 1938. It was originally built for Lever Brothers and became the MIT Sloan School of Management in the 1950’s. Beyer Blinder Bell Architects was hired to complete the renovation and add a new addition. D/2 was specified to… Read More