MB-9 works great for this stuff.  I think Stonecare Central has another version of it too.  But I am not sure if it works exactly the same.<br><br><div class="gmail_quote">On Thu, May 7, 2009 at 10:49 AM, Stuart Young <span dir="ltr">&lt;<a target="_top" href="mailto:santafefc@sbcglobal.net">santafefc@sbcglobal.net</a>&gt;</span> wrote:<br>
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<div>Next week I will be cleaning a shower of the tumbled travertine.  The bottom of the walls have turned black due to mold? mildew?  Its my job to get that stuff off.  What comes to mind is a  15% bleach solution.  Any other ideas out there?</div>
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