all the suggestion above are great.however I would like to make one additional comment. I have seen this before on tiles where gray thin set was used and then the installation got wet. in this case it was staining coming from behind the tile. If none of the suggestions above work than this may be the reason'
 

 
On Sat, Jul 11, 2009 at 1:18 PM, stuart rosen <mail@stoneshine.com> wrote:
Thanks Alot guys for all the input. It is well noted and will more than help us formulate a plan. I will let you know the outcome.


On Sat, Jul 11, 2009 at 10:28 AM, George Barnett <ggservices@charter.net> wrote:

Great suggestions. I would like to add that 3M now has floor pads made from the same material as Mr. Clean Erasers. Just recently began servicing several commercial accounts with these type tiles that use these for cleaning. They clean the stains very easily. Pick up an eraser pad and try it with your cleaner. It may be an easy solution to the problem.
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Stu Rosen
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