I have good luck with Prosoco Liquid marble cleaner...Give that a try

2018-02-15 7:20 GMT-05:00 Stuart Young <santafefc@sbcglobal.net>:

The limestone around this fireplace is dirty from soot. Our conventional methods of cleaning had little or no effect. Any ideas on hot to clean this stuff. Homeowner wants it to look lighter. All the curves do not help the situation.Stuart Santa Fe Floor Care
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Frederick M. Hueston
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