I'd leave it alone and go straight to the dealer. Play dumb, you have no idea what's going on, you've never been to an automatic car wash, never used any abrasive wheel cleaners. Just way "i wash the car myself with soap and water and look at this..."
If the dealer won't cover it, just find a wheel refinishing place that can powdercoat them again for ~$90-130/wheel. Not a huge deal for one rim.
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2013 Cadillac V-Wagon, RIP Z
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