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People cleaning Fort Wayne
Volunteers Clean Detroit Fort with D/2

D/2 supplied a volunteer crew cleaning stonework at the Quartermaster's office and Married Officer’s Quarters at historic Fort Wayne in Detroit, Michigan. The fort is situated on the Detroit River at a point where it is about a mile to the Canadian shore. The original 1848 limestone barracks still stands, as does the 1845 star fortification (renovated in 1863 with brick facing). Outside the original star fort are additional barracks, officers quarters, hospital, shops, recreation building, commissary, guard house, garage, and stables.

On Sunday, September 10, 2017 the National Trust HOPE project and the Historic Fort Wayne Coalition held a volunteer work day at historic Fort Wayne. Nearly 175 volunteers worked on the site in one day. The volunteers were divided into small work groups teamed with preservation trades professionals, many of them members of the Preservation Trades Network. Work consisted of rebuilding and carpentry repair, painting, window repair, repointing masonry, and masonry cleaning with D/2 Biological Solution.

Pope-Leighey House by Frank Lloyd Wright
D/2 at Work on Wright House Wood

In 1939 journalist Loren Pope and his wife Charlotte Pope commissioned Frank Lloyd Wright to design a new home. The design followed Wright's Usonian principles and was completed in 1941. The Pope-Leighey House "Usonian" house was developed by Wright as a means of providing affordable housing for people of moderate means. Many innovative concepts, including spacious interiors, corner windows, and a cantilevered roof, began here and were quickly adapted across America.

The Pope-Leighey House is owned and operated by the National Trust for Historic Preservation. In 1965, the house was relocated to the grounds of Woodlawn Plantation (another Trust site), removing it from the path of a highway project. Located just outside Washington, D.C., the Pope-Leighey House and Woodlawn Plantation share a 126 acre estate that was originally part of George Washington's Mount Vernon.

For more on the Pope-Leighey House, visit savingplaces.org

Person cleaning Fort Wadsworth
HOPE Crew Cleans Civil War Fort

D/2 was used by the National Trust HOPE Crew for cleaning of the stonework at Fort Wadsworth National Historic Landmark. The HOPE Crew is part of a unique program helping to bridge the gap between a declining workforce and maintenance needs.

“HOPE Crew is one of the ways in which we are helping the National Park Service address its maintenance backlog,” said Monica Rhodes, executive director of the HOPE Crew program.

HOPE is an acronym for Hands-on Preservation Experience. The goal is to connect young people with historic landmarks while they get their hands dirty learning a trade.

Since its start in 2014, projects have been completed across the country - including in the Tri-State Area. Volunteers painted over graffiti at Hinchliffe Stadium in Paterson, New Jersey, while at Sandy Hook, New Jersey, HOPE Crew members fixed up Building 26 post-Superstorm Sandy. Today, the HOPE Crew is using D/2, trusted by conservation professionals, to remove biological soiling from masonry at historic Fort Wadsworth's parapet walls.

The Good Cemterian
Good Cemeterian Video Goes Viral Cleaning Veteran Headstones with D/2

Andrew Lumish, “The Good Cemeterian" cleans Veteran headstones with D/2 on his days off. He posted a video one Friday and woke up to find he had six million hits. It's now 18,000,000 and counting.

To see the 90 second video click here: https://youtu.be/vbWqTIjR5zA

D/2 Biological Solution becomes part of a Presidential Executive Order

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.

Click here for the full report.

NCPTT study recommends D/2 for cleaning government headstones

Researchers studied five different cleaners on stones located in five different climates at locations across the United States. Microbiologists at Harvard University evaluated samples for regrowth of microorganisms including bacteria, fungi, and algae. D/2's quaternary ammonium solution came out on top!

Download the Best Practices Document

Read more at NCPTT

3 evaluation of cleaners for government issued headstones from Mary Striegel

D/2 awarded Veterans Administration contract to supply cleaner for over 3.5 million headstones

The U.S. Department of Veterans Affairs is tasked with the regular maintenance of more than 3.5 million white marble headstones nationwide. Based on recommendations resulting from a six-year study conducted by the National Park Service, D/2 has been selected as the preferred cleaner for maintaining these memorials to our country's fallen heroes.

Civil War monuments get D/2 makeover at Chickamauga battlefield.

A six-person preservation team with the National Park Service has been working its way around the Chickamauga and Chattanooga National Military Park giving its Civil War monuments a spring cleaning. The crew, which works out of Frederick, Md., and travels the country to clean monuments, will work at the park for about three months. The group uses the environment friendly cleaner D/2 to clean the structures.

D/2 How-to Video Released

Ever wonder how to apply D/2? Well, you're in luck! Our friends Ken Follett and the Akin Free Library demonstrate two methods for application of D/2: spray-scrub-rinse and spray-and-walk-away. Check out the video and the results!


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.

Vinyl and Canvas

D/2 can be safely used to remove dirt, soot, pollution, and biological discoloration from aluminum and vinyl siding. It can also address these contaminants on canvas and and other exterior fabrics. Although it is not a general purpose cleaner, D/2 has seen use on a variety of substrates that require a sensitive, non-acidic solution.


D/2 can be safely used on most treated wood substrates to remove dirt, soot, pollution, and biological discoloration. Cleaning with D/2 can reduce recurrence of biological growth and, because D/2 contains no acids, bleach, or salts, it will not discolor or damage treated wood surfaces.