I'm looking for some advice on removing what I assume are pollutants or minerals that have accumulated on the top half of the thin bumper strips along the side of my car. This car has lived outside in the Pacific Northwest for most of its 20-year life. The photo below shows the brown stuff that's accumulated on the plastic trim:
The brown stuff is extremely hard and somewhat abrasive. Magic Eraser does not work on it; steel wool cuts the abrasiveness down and smooths it but does not remove it; denatured alcohol doesn't work, nor does brake cleaner; carb cleaner mostly works but not completely, and requires a lot of rubbing.
Do you know of a chemical that will remove this stuff, or have any suggestions on how to get rid of it? I prefer to not have to remove the strips from the car (the one shown above fell off) but obviously will if I have to.
The brown stuff is extremely hard and somewhat abrasive. Magic Eraser does not work on it; steel wool cuts the abrasiveness down and smooths it but does not remove it; denatured alcohol doesn't work, nor does brake cleaner; carb cleaner mostly works but not completely, and requires a lot of rubbing.
Do you know of a chemical that will remove this stuff, or have any suggestions on how to get rid of it? I prefer to not have to remove the strips from the car (the one shown above fell off) but obviously will if I have to.
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