I always carry a bottle of Meguiars Ultimate Detailer and a couple of microfiber towels in the trunk. Spray and wipe does the trick when getting rid of finger prints, dirt and water marks before they set in.
I never wipe my car with A towel dry, even if it is the most expensive microfiber towel in the world, it is just asking for paint marring and swirl marks.
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2012 Z4
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