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Hot brake dust from rail cars used to do this to painted new vehicles, dunno if it is related here. Either that or low grade stainless steel, or both.

Hot brake dust from rail cars used to do this to painted new vehicles, dunno if it is related here. Either that or low grade stainless steel, or both. [Archive](https://archive.today/kfxQE)

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[–] 2 pts

Wait!!!

Stainless steel isn't supposed to rust.

Maybe I was too quick to trust the science.