How can I clean Stained stainless steel? Is it ruined forever?

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I managed to stain my sink when I placed a scrub brush in it that still had some toilet cleaner gel on it. Any ideas how to clean it or is it damaged forever? Be careful it you use the grout cleaning hint using cleaning gel. This is what happens to any stainless steel in the area. Got a splash on my new s/s refrigerator as well.
q stained stainless steel
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