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No direct experience, but when I bought a BMW Z3 in 1997, it had a black top. The delivery process included explanations of lots of features on the car. Under the hood I noticed the windshield washer fluid was not the typical blue stuff. Was told that was because the blue stuff could stain the tan tops on Z3's so they were all filled with the special stuff on the assembly line. I've seen a lot of convertibles with tan and grey convertible tops that looked pretty stained, but without knowing the owners and how they care for their cars, obviously can't say the tops are hard to maintain.
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