I have a 2015 Mercedes S550 with 20" rims. A bottle of this cleaner cleaned all 4 discs. And nothing else! did a little scrubbing to wash everything off but it worked out fine. It took quite a while for all of the blackness to wash out completely, but it was easy to tell if I had washed it all off. I would buy it again, but I'm wondering if there's anything cheaper that works just as well.
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