Hard to tell from the pics but the stone at the base of the stall appears darker. I have seen dense stones like travertines and botticino have these issues in shower stalls.
If that is grout at the joint(floor) it needs to be properly caulked.Shower stall may need to be dryed out.
Any mold and mildew remover is only a temporary fix if the moisture cant be resolved. Using the vent or keeping the doors open and using a squeegee may help.
Wouldnt hurt to hone the walls getting rid of the streaking and making it uniform-using 280g honing powder should do it.
Sealing in a shower stall wont reduce the occurence of mold.


 
On Mon, Jul 18, 2011 at 11:35 PM, <klhudson@atlantastoneandtilecare.com> wrote:
James,

I would try SCC mold & mildew cleaner with a soft bristle brush followed with a impregnating sealer.

KevIn

Sent via BlackBerry by AT&T


From: James Billeaudeau <james@diamondmarblepolishing.com>
Date: Mon, 18 Jul 2011 17:03:09 -0500
To: Restoration and Maintenance<sccpartners@stoneandtilepros.com>
ReplyTo: "Restoration and Maintenance" <sccpartners@stoneandtilepros.com>
Subject: [sccpartners] Travertine Shower Walls

Hi Partners,
 
Can you share advice on how to handle the restoration of a honed travertine tile shower?  The shower was built in 2002 and purchased by the existing owner in 2003.  It has three walls with a total width of 12 feet and the tiles extend up 9 feet high.  Nothing has ever been done to the shower by the previous or current owner other than wiping down the walls with over the counter cleaners.  Each wall has what looks like mildew staining in the first tiles from the floor. I came up empty when scraping the walls wtih a single edge razor blade.  Nothing came off of the tiles.  The mildew looking staining seems to be embedded in the stone, and there are also mineral staining on the tiles from the shower head down.   I've enclosed photos of the "mildew" staining.  Any advice would be appreciated.  This would be my first travertines wall restoration and would appreciate guidance in the proper way to approach. Thank you all in advance.
 
James L. Billeaudeau
Diamond Marble Polishing
Lafayette, Louisiana

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Stu Rosen
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www.mbstonecare.com 
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