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My M4 arrived several months before my pressure washer, so during that time I utilized a detailing brush to clean the slats of winter muck. By the end of that period, my grille slats had numerous superficial swirls. I used my RUPES Bigfoot Nano polisher (2" fine polishing pad) and CarPro Essence to bring back the slats to as-new condition. A 5- or 10-minute task, tops, with the right tools .
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