Originally Posted by
bmikiten
I had a 316 stainless sink that had similar stains on the corners. It turns out that the grinding and finishing wheels used to clean up the welds had steel (non-stainless) in them and impregnated the sink. I would clean it with various rust removal products over the years and finally just painted the corner with the problem using a silver rust-oleum paint. It didn't match perfectly but solved the problem and since it was just about a 1/2" wide section, I just masked it and it looked ok.
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