We don't. Although there are many advocates of Wet and Forget, it has not been approved by the cemetery conservators and National Park Service. As our goal is to do no harm, we use what we know is safe. If you are cleaning your family stones and you know they are granite, it is likely you won't have any issues. Marble is another matter and I would play it safe.
Like d2 wet and forget has been tested and approved by the American Cemetery Administration. If the headstone or marker displays biological growth (algae, mildew, moss, lichens), water with a product formulated for cleaning these growths may be required. Examples include: Prosoco ReVive, Cathedral Stone Bio-Cleaner, Wet and Forget, and D/2 Biological Solution.
@@davidgabrielsen2139 I wanted to follow up on this as there was an excellent discussion on the LadyTaphos tiktok about the use of Orvus, D2 and W/F. W/F is approved, with a lengthy list of precautions due to its toxicity to humans and the need for protective gear. That is enough to cause me concern.
Pressure washing is far too powerful for marble headstones. Marble is actually a soft stone and the grime and growth can get below the surface of the stone. If you try to power wash, you will remove more stone. The hand washing helps to get rid of the grime that is on the surface and the D-2 cleans and kills the rest.
