On Fri, 12 Jan 2007 04:07:07 GMT, "Sue"
wrote:

I appreciate the insight - but what household cleaners would be acidic? Any
suggestions?

A lot of bathroom surface cleaners are acidic. Check the list of
ingredients for citric acid, phosphoric acid, oxalic acid, acetic acid
(vinegar), etc. Sounds like you need a cleaner specifically approved
for marble.

Note that the reason such cleaners are acidic is to aid in the removal
of hard water stains. Those stains are largely calcium carbonate;
exactly what your tiles are made of.