Dear Eric:
You can use a powerful alkaline stone cleaner formulated for the removal of biological soil (mildew and mold) rated “for natural stone” like MB-9. Spray it on liberally and let it do most the work. It may take several minutes. Repeat if necessary, and, in the most stubborn areas, help the products with a medium bristle laundry-brush. Rinse thoroughly with a hose when finished and let it dry. Done!
May I ask you now to please read and e-sign our Statement of Purpose at:
http://www.marblecleaning.org/purpose.htm?
Ciao and good luck,
Mauri
Article ID: 901
Created On: Mon, Dec 10, 2007 at 4:15 PM
Last Updated On: Mon, Dec 10, 2007 at 12:00 AM
Authored by: Maurizio Bertoli [mail@mbstone.com]
Online URL: https://marblecleaning.org/knowledgebase/article.php?id=901