could be acid damage as well. I would first test it for moisture and see if that is the problem. If it is, than you it may be a problem since it is an exterior application and water will continue to be a problem.  if its acid damage it may be repairable..maybe.  Test it first and see what it is.  DO NOT try sealers or color enhancers..this will only make it worse<br>
<br><div class="gmail_quote">On Tue, Feb 7, 2012 at 8:09 PM, Lorne Greenberg <span dir="ltr">&lt;<a target="_top" href="mailto:lorne@fabracleenstoneandtilecare.com">lorne@fabracleenstoneandtilecare.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
These tiles were put down 5 years ago and only about 6 months ago began<br>
showing this.  I believe it is the sediment (salts, etc..) finally coming<br>
through after the years of getting wet and drying out.  Is this correct? All<br>
they have tried is acidic cleaners (strong ones) Either way, what is it and<br>
how can it be fixed?<br>
<span class="HOEnZb"><font color="#888888"><br>
<br>
Lorne Greenberg<br>
Fabra Cleen<br>
&quot;Getting all the dirt since 1949.&quot;<br>
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