Look at the Klenztone products. I've had great luck with them on limestone.

Tim Lesnar
Classic Marble Restoration
763-784-2483 office
612-250-0041 cell

Fred Hueston wrote:

Roger

Contact ProSoCo  they have some great products for exterior stone


On Mon, Aug 26, 2013 at 12:02 PM, Roger Konarski <qm144@yahoo.com> wrote:
Would appreciate a recommendation for a product to clean exterior limestone. Pls see attached picture. They also have some areas ( sorry the pictures turned out blurry, thus no pictures) but the last person who serviced the stone applied sealer that left streaks. Hopefully the cleaner will remedy that problem. Thanks in advance for your help.
 
Sincerely,
 
Roger Konarski
Restoration Stoneworks

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--
Frederick M. Hueston PhD
www.stoneforensics.com
www.stoneandtilepros.com
www.safeandcompliant.net

Recommended stone care products  http://www.stonecarecentral.com

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