it looks like it coming from underneath..If this is the case it most likely cannot be removed. You can always try a poultice with iron out.

On Mon, Sep 18, 2017 at 11:54 AM, Mike Alston <realmikealston@gmail.com> wrote:
Good afternoon Pros, this looks like rust. If so is there anything that can be done to clean this up. Looks like it through the stone completely in some parts.


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