Try Vinegar
It will remove most oily film, pollution residues. Wipe down with vinegar then wash off with your regular high quality car shampoo. DO NOT get vinegar on paint as it will etch into it. See if this helps.
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2013 X3 Msport, White/Black Montana, M-Sport/Prem Pkg, Dynamic Handling, Xenons, Cold Weather, HU, Prem Stereo
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