D/2 Biological Solution

D/2 is a safer, easy to use liquid used to restore brick, stone, concrete, wood, vinyl & aluminum siding, fiberglass, metal, paint and canvas.

A contact time of only 10-15 minutes will remove stains caused by algae, mold, mildew and lichens with manual scrubbing. Fungi, algae, lichens, mold and mosses contribute significantly to the degradation and disfiguring of many types of construction materials.

Tested and used by the Department of Veterans Affairs and the National Park Service, D/2 is a biodegradable cleaner that is ph neutral and contains no salts, bleach or acids. It is highly effective for removing stains caused by mold, mildew, algae, lichens and air pollutants.

D/2 Comes in Four Different Quantities:

1 Quart

1 Gallon

5 Gallon

55 Gallon

Sprayed with D/2 Biological Solution Fall 2010.
Photographed Spring 2011.

No scrubbing or washing. Biodegradable, no bleach, no acid, no salts. Will not harm plants, stone or you.
  Some of the historic applications of D/2:
  • The White House
  • Smithsonian Museums
  • Gettysburg Monuments
  • National Cemetery
  • Frank Lloyd Wright Foundation
  • Tomb of the Unknown Soldier
  • US Capital
  • Lincoln Memorial
  • US Naval Academy
  • Antietam National Cemetery
  • Vicksburg National Cemetery
  • Mount Vernon
  • The Acropolis
  • Congressional Cemetery
  • West Point Cemetery

D/2 was recently used as the cleaner for the Chicago Museum of Science



National Park Service presents D/2 to the National Cemetery Administration and Veterans Adm. In Powerpoint Presentation.
See item #32
"Of the five cleaners tested, D/2 Biological Solution was most effective and left no harmful residues.
Day break is a bleach. Continued use of Daybreak will result in long term damage to headstones.
Use of high pressure power washers can erode the surface and deteriorate headstone.

Chicora Foundation uses D/2
"Heavy growth should be cleaned with undiluted D/2. For lighter deposits D/2 can be diluted with potable water from 1:1 to 1:4 parts water by volume."

Illinois Historic Preservation Agency - Cemetery Preservation Training uses D/2
"Approved Biological Cleaner- D/2 Biological Solution"

Michigan Historic Cemetery Preservation Guide uses D/2
See page 86
"Lichen and other organic growths can be treated with the architectural anti-microbial product, D-2, to prevent the damage that these growths cause."

Ohio Gravestone Guardians uses D/2

Iowa's State Association for the Preservation of Iowa's Cemeteries uses D/2

Boy Scout/Civil War Project in state of Washington uses D/2

Southern genealogist uses D/2
"By the way, if you’ve read this far, I personally thank you – your research will pay off. I’m posting personal photos below to prove that D/2 works, and I want to educate the public about this wonderful product. I don’t work for anyone who makes or distributes the product. I’ve done my research, and so has the US Federal Government, who’ve proven that D/2 works and they currently employ D/2 for cleaning our national treasures."

Brad Manzenberger, noted stone conservator cleans Civil War headstone with D/2;
Others write article about it

Dick Eastman Noted genealogist uses D/2
This is basically a third party ad for D/2 with links and product photos.

Savannah Specs D/2 for cleaning stucco.
"The recommendation is met. The proposed D/2 Biological Solution is appropriate for cleaning historic stucco."

Maine Old Cemetery Association uses D/2