Cleaning limestone hearth

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Alphatype

New Member
Apr 19, 2017
1
02771
Hi. I just installed a limestone hearth on my new gas fireplace. There is some strange staining I can't seem to clean. Or are they not stains? There's a ring around the inside and a large dark section on the left.

I've been using stone tech klenzall but that hasn't helped.
 

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