CJ, for outdoor monuments that have a buildup primarily of green algae/ mildew and the like I have used D/2 biological solution by cathedral stone products. I have used this successfully on stones that have endured floods etc. it is just applied and left to do its work. This is different than treating salt deposits, but you may have more than one thing going on. It is recommended for headstones by the company.
Baird
http://www.cathedralstone.com/
On Wednesday, February 29, 2012, CJ Crow <cjcrow@stonemaintenanceinc.com> wrote:
> Does anyone know of a good method to restore/clean granite headstones/monuments? For the most part I need to remove surface stains caused by hard water.
> --
> CJ Crow
> President
> Stone Maintenance, Inc.
> (970) 324-5147
> www.stonemaintenanceinc.com
>
> Have you downloaded our Free Stone and Tile Care Guide? Visit the Care Tips page
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