If there is growth remove using a wooden scraper.
White marble gravestone cleaner.
If these are present it may be best to leave it as is.
Steps to clean a marble headstone.
A more widely available product wet forget moss mold mildew and algae stain remover 29 98 a gallon at home depot is advertised as being suitable for cleaning headstones.
As with interior marble cleaning soak the cemetery headstone with water before adding a cleaner.
Wetting the marble first will provide better cleaner spread on the surface and make rinsing easier.
Cleaning weak marble can result in further irreparable damage.
But it hasn t.
Different types will require different cleaning methods.
Cleaning a white marble gravestone requires care and some special tools but it is a relatively easy task that can be accomplished in one afternoon.
Clean a marble gravestone.
An undiluted cleaning agent may leave a residue in the marble s pores.
Inspect the entire headstone for cracks wear and signs of damage.
Pre wet the stone with clean water.
Remove as much of the lichen and moss with your hands as possible.
Marble needs to be treated even more gently than granite.
Make and apply a poultice if steps 1 to 3 fail to remove the mold and mildew stains on the marble headstone make a poultice with cotton balls hydrogen peroxide and ammonia.
It is important that you know what type of stone you are dealing with.