They do have a moisture problem..You can try a pressure washer with a mild acid wash. Otherwise get out the ole scrapers.<br><br><div class="gmail_quote">On Mon, Aug 23, 2010 at 11:51 PM, Mike Marsoun <span dir="ltr">&lt;<a target="_top" href="mailto:nulifesc@bigpond.com">nulifesc@bigpond.com</a>&gt;</span> wrote:<br>
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<p class="MsoNormal">Hi Guys,  any ideas for a mechanical way to get rid of this?
 It looks like silica…  There are also a lot of areas where it is in the
grout and weeping down stair risers. Last resort will be hand scraping. </p>

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