D/2 Biological Solution

Notable D/2 Projects

Acropolis of Athens

Conservators at this 2,000 year old site restored over 2,675 tons of Pentelic marble and imported D/2 to do the cleaning work.

Tomb of the Unknown Soldier

More than 4 million people visit hallowed memorial each year. D/2 is used to keep its Yule Marble looking flawless.

White House

The National Park Services trusts D/2 to keep America’s iconic White House looking white.

NY Public Library

In celebration of this iconic building’s 100th anniversary, it was given a facelift with D/2, washing away years of dirt and grime.

Nothing works harder in Washington DC…

Congressional Cemetery

During its restoration of the 168 Benjamin Latrobe designed sandstone cenotaphs, the National Park Service chose D/2 to do the cleaning.

Biltmore Estate

The facades and much of the interior of The Biltmore Estate is Indiana Limestone. D/2 Biological Solution has been a significant part of their maintenance cycle for many years.

Statue of Liberty

While the lady herself is Copper, her pedestal and surrounding landmarks on Ellis Island are regularly maintained with D/2 Solution.

Museum of Science and Industry

There’s no job too big for D/2. The ornamented facades of this 400,000 sq ft Chicago Landmark were cleaned from top to bottom with D/2.
Developed for Conservators by Conservators
Quick Overview

D/2 has been successfully used to clean millions of buildings and monuments. From the White House to Arlington Cemetery, D/2 is trusted to work and keep on working when results matter.

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 a Biodegradable cleaner that is PH neutral and contains no salts, bleach or acids. It is highly effective for removing stains caused by biological growth on surfaces including marble, granite, limestone, masonry, concrete, wood, canvas and vinyl & aluminum siding. It will not damage glass, metal or plants.

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

Method For Use:

Apply D/2 with a brush, roller or sprayer
Allow the undiluted D/2 to remain on the surface for 5 to 10 minutes
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.


  • masonry
  • stone
  • concrete
  • wood
  • asphalt shingles
  • vinyl & aluminum siding
  • fiberglass
  • metal
  • paint
  • canvas, etc.

Benefits and Attributes

  • Will not damage glass, metal or plants
  • PH neutral
  • Contains no salts, bleach or acids
D/2 Application Video
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.

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.

Order D/2 Biological Solution
D/2 Biological Solution is available in Quart Sprayer, 1 gallon and 5 gallon containers. It is also available in and 55 gallon drums. The area that can be treated with one gallon of D/2 will vary considerably as a function of the nature and extent of biological deposits, as well as the physical characteristics of the surface. Typical coverage to remove medium deposits will vary from 250 to 350 square feet per gallon.

Quart Sprayer - $18.95

2 Gallons - $80.00

1 Gallon - $45.00

5 Gallon Pail - $189.00

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