Removing Fading and Stains on Chrome Trim 1982 300SD

I have a 1982 Mercedes 300SD and the trim around the windows looks faded and ugly. It is as if they look like "hard" water stains on all the chrome door and truck trim. I have tried "windex" type cleaner to Bar Keeper's Friend to no avail.

Any tips on cleaning? Do not want to have the replace the trim.

Thanks
Jim

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