Choose pH-neutral cleaners specifically formulated for stone to prevent irreversible etching and discoloration on granite, marble, or limestone monuments. Test any solution on an inconspicuous area first, waiting 24-48 hours to observe potential adverse reactions before proceeding with full application.
Apply biological growth removers containing quaternary ammonium compounds or hydrogen peroxide for algae, lichen, and moss removal, allowing 15-20 minutes of dwell time before gentle agitation with natural bristle brushes. Avoid pressure washers exceeding 500 PSI, which can erode softer stones and drive contaminants deeper into …









