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So far, I've tried:
1. Usual interior quick detail products;
2. Chemical Guys APC ("Nonsense"), undiluted;
3. Household white vinegar, with dwell times between 0-30 seconds.
No significant change.
I even spot tested -- very carefully, and with very short contact time -- CLR, which didn't help.
No damage appears done, but the spots remain. Have yet to try the abrasives in hopes I'd find a chemical option and not have to worry about scratches.
Any other product suggestions?
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