May it is the window? Have you tested it at all to see if it is rust, acid or maybe even cleaning products.....such as cleaning that window with lots of window cleaner?

On May 8, 2012 10:30 AM, "Roger Konarski" <qm144@yahoo.com> wrote:
My question is, what is causing the drip like marks on the limestone? Please see attached picture. 2nd question, what can be done to fix the problem?
 
Thanks,
 
Roger Konarski

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