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this post was submitted on 21 Feb 2024
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Contaminated by what? CONTAMINATED BY WHAT MOTHERFUCKER
Most likely metal dust, called fallout by detailers and "flying rust" by some. Mostly comes off brake discs and railroads and other things that grind ferrous metals.
Common pest for anyone washing their car. There are chemicals that are useful. Mostly those smelling of eggs and turning purple on contact with iron.
You can buy versions of it that don't smell like eggs, though they never smell good. That it turns purple is convenient when you spray it off, imho at least.