Washed the car the other day and found some odd yellow/orange/green spots on the front bumper. At first I thought it was just bug residue, but it didn't come off during the wash or with a clay bar. Oddly, the surface is perfectly smooth. Next thought it was iron residue, so tried Iron X, no change. Finally, I tried dish detergent, no change. So now I'm stumped. Any thoughts?
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