Klenzstone #3 should work well on that-Some acidic compounds should work well also. 

On Tue, Aug 23, 2016 at 3:55 AM, Stephen Webb <stephen@newlifemarblerestoration.com> wrote:
I had good results with ammonia poltice on copper 


On Monday, August 22, 2016, Micah <micahgautier@gmail.com> wrote:
Any one have a silver bullet for this? Copper staining

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