Does anyone have a suggestion on how to clean the plastic trim around wheel arches? I drive on gravel roads in the forest quite a lot and the white looking residue you can see in the attached picture comes from the mud and whatever else is under the gravel spraying up when the roads are wet. I only need to wipe a wet cloth over the trim (after a proper clean) and the white patches disappear completely but return once dry again. I have tried a variety of things but none of them seem to work.
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