D/2 Biological Solution is a biodegradable, environmentally friendly, easy-to-use liquid that removes harmful staining. It works on mold, mildew, algae, lichen, & air pollutants. It can be used indoors and out. It's safe for natural stone, cast stone, masonry, metal, vinyl, canvas, wood, and roofing surfaces.
Ted Kinnari studied at Columbia University’s Graduate School of Architecture, Planning and Preservation. He created D/2 in the late 1970's with the help of Professor Norman Weiss, an analytical chemist by training.
As D/2 became known among the global conservator community its popularity spread. It is now used across the United States and in Europe for historically significant cemeteries and monuments, World Heritage Sites, museums, state capitol buildings, national landmarks, and much more.
D/2 was developed by conservators who understand the damage that can be done by cleaners containing acid, bleach, and salts. Our product has been specially formulated without these harmful agents. D/2 is a nearly pH-neutral quaternary ammonium solution with surfactants that help carry surface contaminants away. No other solution is more trusted by architectural and monument conservators.
D/2 has been successfully used to remove staining from a variety of surfaces including marble, granite, limestone, sandstone, slate, brick, cast stone, concrete, wood, all metals, vinyl siding, and canvas.
D/2 has been successfully used to clean millions of headstones and monuments and thousands of building facades. From the White House to Arlington Cemetery, D/2 is trusted to work and keep on working when results matter. It is the only product tested and approved by our National Park Service.