product to clean black mould off of a headstone

[triplets]

my sons and dads headstone have both got black marks from an overhanging tree, the marble is very porous, any tips?

triplets, this looks interesting about how to remove different types of stains with different materials..i remember doing a mosaic course years ago and watching the marble we used fizz away if the wrong chemicals got onto it..so be v careful!

Tripets, if you contact the funeral directors they will be able to send someone out to clean it.

I had my sons cleaned and the lettering releaded a year ago

Hi,
We have the headstones insured, I wonder if we could get it done with that?

Would soda crystals work?