I ran across what looks like a similar kind of thing on an interior limestone wall of a church. The limestone was heavily oxidized and the drip marks were built up white calcereous salt deposits.  We tried cleaning with different products, but the problem was that the limestone etched under the &quot;drip&quot; marks.  We basically used electroplated diamond discs (I think around 220 grit, maybe less) to take off the oxidation, drip marks and etching.  Came out really well.<br>
B<br><br><div class="gmail_quote">On Tue, May 8, 2012 at 10:49 AM, Georgia <span dir="ltr">&lt;<a target="_top" href="mailto:georgia@stonebuff.com" target="_blank">georgia@stonebuff.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<p>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?</p><div class="HOEnZb"><div class="h5">
<div class="gmail_quote">On May 8, 2012 10:30 AM, &quot;Roger Konarski&quot; &lt;<a target="_top" href="mailto:qm144@yahoo.com" target="_blank">qm144@yahoo.com</a>&gt; wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

<div><div style="font-size:12pt;font-family:arial,helvetica,sans-serif"><div>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?</div>

<div> </div><div>Thanks,</div><div> </div><div>Roger Konarski</div></div><hr>
<p>Powered by <a target="_top" href="http://www.discussthis.com" target="_blank">http://DiscussThis.com</a>
<br><a target="_top" href="http://www.discussthis.com/members/sccpartners@stoneandtilepros.com" target="_blank">
Visit list archives, subscribe, unsubscribe or change your subscription preferences
</a>
<br>
<a target="_top" href="mailto:sccpartners@stoneandtilepros.com" target="_blank">Start a new conversation (thread)</a>
</p>
</div></blockquote></div>
<hr>
<p>Powered by <a target="_top" href="http://www.discussthis.com" target="_blank">http://DiscussThis.com</a>
<br><a target="_top" href="http://www.discussthis.com/members/sccpartners@stoneandtilepros.com" target="_blank">
Visit list archives, subscribe, unsubscribe or change your subscription preferences
</a>
<br>
<a target="_top" href="mailto:sccpartners@stoneandtilepros.com" target="_blank">Start a new conversation (thread)</a>
</p>
</div></div></blockquote></div><br><br clear="all"><br>-- <br>PLEASE NOTE OUR NEW ADDRESS AND PHONE NUMBERS.  THE OLD NUMBERS WILL WORK FOR SOME PERIOD OF TIME.<br>________________________________________<br>From the desk of<br>
Baird Standish<br>Managing Partner<br>Facility Specialists, LLC<br>15 West Highland Ave.<br>Philadelphia, PA 191118<br>Phone: 267-331-5369<br>Fax: 267-331-5771<br>