D/2 Biological Solution


Zero VOC Product

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.

D/2 is biodegradable, PH neutral and contains no salts, bleach or acids. It will not etch metal or glass or damage plants, and is highly effective for removing stains caused by biological growth on surfaces including: marble, granite, limestone, masonry, concrete, wood, canvas and vinyl and aluminum siding.

Drum size also available. To order, please call (800) 425-2214.


D/2 is the only product developed for conservators by conservators. It has been successfully used to clean millions of buildings and monuments, from the White House to Arlington Cemetery.

  • Will not damage glass, metal or plants
  • PH neutral
  • Contains no salts, bleach or acids

D/2 Cleaning Demo

Tested in a 6-year study and now specified by the Department of Veteran Affairs National Cemetery Administration.


  • Masonry
  • Stone
  • Concrete
  • Wood
  • Asphalt Shingles
  • Vinyl & Aluminum Siding
  • Fiberglass, Metal, Paint, Canvas, etc.

Additional Information


Method for Use

– Apply D/2 with a brush, roller or sprayer
– Allow the undiluted D/2 to remain on the surface for 5-10 min
– Apply additional D/2 to maintain a wet surface
– Scrub the surface thoroughly with a non-metallic, short fibered scrub brush
– Lightly mist with water and continue scrubbing
– Rinse thoroughly with fresh water using a hose or sprayer

Treatment and Maintenance Program

After initial treatment of substrate, a once-a-year light spraying will help maintain a clean, stain-free surface.

Note: Heavy biological deposits may require repeat applications of D2 cleaner to achieve complete cleaning after detachment. Alternatively, heavy growth can be detached by manual scraping using wooden or plastic tools immediately after application.


Quart, Quart Case (12 quarts), Gallon, Gallon Case (4 gallons), 5gal Pail


D/2 Biological Solution

In stock
$18.95 $227.40
Clear selection