For example, pH 4 is ten times more acidic than pH 5 and 100 times (10 times 10) more acidic than pH 6. D/2 is also safe to use on natural stone, including marble, granite, limestone, sandstone, slate, brownstone, travertine and terra cotta.

The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network. A contact time of only 10 to 15 minutes followed by scrubbing with a soft bristle scrub brush will loosen most biological and air pollutant staining. 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. Most purchases from business sellers are protected by the Consumer Contract Regulations 2013 which give you the right to cancel the purchase within 14 days after the day you receive the item.Additionally, they conducted accelerated laboratory tests using fungi to distinguish between the best field performing cleaners. Alabama Cemetery Preservation Alliance - Alabama Historical Commission - Andrew Johnson National Cemetery - Antietam National Cemetery - Architect of the Capitol - Arlington National Cemetery - Biltmore Estate - Columbia University - Congressional Cemetery, DC - Dartmouth College - Department of Veterans Affairs - DuPont Estate - Florida State Capitol - Fort at Old San Juan, Puerto Rico - Frank Lloyd Wright Foundation - Georgia Municipal Cemetery Association - Gettysburg National Cemetery - Harpers Ferry - Harvard University - Holocaust Museum, DC - Indiana Department of Natural Resources - LBJ Library - Louisiana State Capitol - Loyola University - Metropolitan Museum of Art, NY - Mississippi State Capitol - Montana State Capitol - Monticello - Mount Auburn Cemetery, MA - Mount Vernon - Museum of Natural History, NY - Museum of the American Indian, DC - Natchez National Cemetery - National Park Service - National Portrait Gallery, DC - New York Public Library, NY - Old Burial Hill, Plymouth, MA - Oregon Historical Commission - Princeton University - Rice University - Rochester University - Rowan University - San Juan Capistrano - Smithsonian Institution - Swan Point Cemetery, RI - Texas Historical Commission - The Alamo - The White House - Thomas Jefferson Cemetery - Tomb of the Unknown Soldier - U. FRAGILE HEADSTONES – If a very fragile headstone needs cleaning, it’s best to use the “hands-free” method – wet the stone, spray the D/2 + water solution, then walk away. Recommended biocidal cleaners include D/2 Biological Solution (which was tested in this study) manufactured by Sunshine Makers, Enviro Klean® BioWash®, or other cleaners that contain quaternary ammonium compounds. Sodium lauryl sulfate is a “surfactant” – it removes stains and residues that are oily, so it’s found as an ingredient in lots of surface cleaners.

From the White House to Arlington Cemetery, D/2 is trusted to work and keep on working when results matter.A soaplike compound that lathers easily, used chiefly in laundry detergents, cleaning products, and toiletries such as shower gel and shampoo. For sure value for money, if you could get a 'professional' out, they would do the same job, probably use similar chemical and of course charge my poor mother a fortune. Clean your ancestor’s gravestone the same way the professionals clean the Gettysburg Monuments, the Alamo, and the Tomb of the Unknown Soldier! Another great benefit of D/2, you won’t need to keep cleaning your headstones often – once a year is sufficient, and you might be able to clean them every 2 or more years, depending on need. By using D/2, you are cleaning the organic material off the stone and in so doing, you may reveal damage to the stone you wouldn’t have otherwise seen.

Bases are ionic compounds that break apart to form a negatively charged hydroxide ion (OH –) in water.In general, chelates containing five- or six-membered rings are more stable than chelates with four-, seven-, or eight-membered rings. Two independent labs were chosen and Harvard was chosen as a third lab to look over the findings of these two labs. A contact time of 10 to 15 minutes followed by scrubbing with a soft brush will loosen most biological and air pollutant staining. Content on this site is not intended to substitute for advice given by medical practitioner, pharmacist, or other licensed health-care professional. D/2 can be used on all kinds of masonry surfaces, including brick, stone, concrete, stuccos and plasters, terra cotta, monuments, sculptures, and headstones.