Soak the stone with water to saturate any growth that may be present.
Cleaning marble grave monuments.
Mix 1 tablespoon of the non ionic soap with 1 gallon of water.
Soak the stone by spraying it down with a hose or dumping a bucket of clean water over the entire surface.
After the rinse water drains examine the surface for any areas that need additional attention due to moss lichen algae or other organic growths or particularly dirty soiled spots.
Cleaning weak marble can result in further irreparable damage.
Wetting the marble first will provide better cleaner spread on the surface and make rinsing easier.
However it still must be a very gentle cleaning.
As with interior marble cleaning soak the cemetery headstone with water before adding a cleaner.
Wait 15 minutes and spray the surface again.
Wash the granite headstone several times with another clean rag or cloth.
Cleaning gravestones with bleach is never a good idea church said but it s especially bad when you re working on porous stone.
Dry the granite headstone when you finish washing the granite headstone use a clean white cloth to dry the headstone immediately.
Do not re use the cloth that you used with the soapy water.
This second spray will work the product into the second layer of the lichen.
Use the wooden scraper to remove any algae or moss growth from the surface.
The most gentle way to clean is to spray it on and allow mother nature to do the rest since the more you agitate the stone the more wear you cause on the stone and fine edges of the engraving.
Lichen is one of the more challenging growths to clean from memorial stones.
Currently a product called d 2 is recommended and is the cleaning agent used on the white house and various statues and monuments.
An undiluted cleaning agent may leave a residue in the marble s pores.
To remove lichen saturate the surface with wet forget.
The hardest of the natural stone type of monuments that you will see in a cemetery is granite which is still widely used today granite has a hardness of between 7 and 9 and can withstand a little more cleaning than the other types of natural stone.
A note about removing lichen.
Spraying down the headstone first will help maximize the effectiveness of the cleaning solution.
Use soft bristle brushes and a mild stone cleaning solution mild ionic soap or detergent ph neutral working in a circular motion to gently remove dirt and dust.
Once you have completely wiped the surface s with your sponge rinse the marker or monument thoroughly with clean water.
Wooden or plastic scrapers can be utilised to remove larger build up such as bird poo or moss and lichen.