I used to take care care of several spas in a ski town. They all had this orange stuff build up. Best I could ascertain was that it was just a creation of soap, oils, heat, water, etc. It always came back unless the cleaning was consistent. I have found that the SC soap film and/or mold remover works on natural stone. Hope this helps.

On Mon, Feb 28, 2011 at 8:09 PM, Fred Hueston <fhueston@gmail.com> wrote:
it looks like something is getting into the small pits of the stone.you may be right, it could be sunblock.  If the MEK cleaned it up and it came back chances are its something they are using in the shower..soap, shampoo, etc.

On Mon, Feb 28, 2011 at 9:27 PM, <stephen@newlifemarblerestoration.com> wrote:
Greetings everyone, The orange seen in the spots on the tile in the photo is a stain apearing in the holes that have grout and the grout lines. it's in a bathroom. I've only had this show up in the bathrooms of some vacation condo's I service. I was thinking it might be aresol sunblock. I thought I cleaned it with MEK but it soon came back  Has anyone seen this before and had sucess cleaning it. Thank you
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Frederick M. Hueston PhD
Recommended stone care products  http://www.stonecarecentral.com/?Click=2149

Many of my informational articles can be found at www.stoneandtilepros.com

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The Ultimate Stain Remover  www.GoDrFred.com

Cell 321-514-6845


Don Semi
Certified Stone and Tile Inspector