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Bumper is made from Mineral and Rubber FIller polypropylene with a glass fill poylpropylene re-inforcement bar across the back.
I have seen this problem once or twice on various cars, usually after I've been using an angle grinder or similar nearby.
Specks of metal rest on the surface, get wet then rust, and it can stain the paint...usually need a good clean with a paint cleaner then waxing.
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Run Forrest , Run.......
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