Try sanding the sink with 320 (or whatever matches the grain) grit sandpaper IN THE GRAIN of the surface. If necessary, finish with finer grit. Do it and the nearby areas with green Scotchbright. It will look like 2 weeks ago. Then consider some film to protect it. Cutting board oil? Canola oil? Nothing?
The cause is acidic materials on the cheap "stainless steel" The good news you can abrade the surface and make it fresh.
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