Over time moss, lichen or other pollutants will attach themselves to gravestones' surfaces. Not only does this make it very difficult to read inscriptions and see other details it can actually cause permanent damage.
Cleaning the gravestone is therefore an important part of the preservation process. We use D/2 biological solution on all gravestones to remove the unsightly and damaging growth without causing any harm to your historic markers.
Other methods such as power washers, sandblasting, using bleach, acid and other strong chemicals as well as excessive scrubbing will cause irreparable damage.
Our methods can take a few weeks to show their full effect but they are long lasting and will not harm the gravestone or monument.
D/2 has been used on the White House, Acropolis in Athens and more. Pictures are available at this link from the manufacturer.