Removing a stain/discoloration in our sink...

We've had this discoloration in our sink for some time. Is there anything we can do to remove it, or at least make it less noticeable?



Here's a pic:



20150403_153849_zpscrcbbwhf.jpeg Photo by hikerguy1 | Photobucket



Thanks,



Andy

Removing a stain/discoloration in our sink...

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