Looks like mold. Try oxyclean in a test area

Sent from my iPhone

On Jan 25, 2018, at 10:58 AM, Anthony Godoy <agodoy4894@gmail.com> wrote:

There are black spots coming from the joints does anyone have an idea of how to remove this. 

Thank you in advance. 

Anthony Godoy
Godoy Stoneworks and Tile Care
Www.godoystoneworks.com

 
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