I Placed a copper ornament Into a plastic baggie full of Tarnx in my stainless steel sink and let it soak for 3 days to get the tarnish off, now I have a nasty stain I can not get out. I’ve Tried steel wool. . Tarnx more. . . Ajax. . . Soft Scrub. . . Even a paste made of baking soda. . . Can anyone know how I clean it up?

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