Have you tried ReKlaim Cleaner & Activator. This is a great mold cleaner/killer. Also keep in mind the possibility that it could be sub surface mold growth coming to the surface. 

Kindly,

Greg Cook

Surface Solutions inc.

808.298.3090

Follow us on Instagram - surfaceshawaii1

www.surfaceshawaii.com

On Oct 30, 2017, at 9:05 AM, Anthony Godoy <agodoy4894@gmail.com> wrote:

Hi partners, 

We have used several stone cleaners as well as chlorine on this stone. Nothing seems to be working on this. Does anyone have a suggestion what we can use to remove this? 

Thank you 

 
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