I owned a Z3 for 18 years. Now, it was kept in a garage, but otherwise I treated it as a normal car top, washing it when I washed the car. After 18 years I had zero issues with the top. Given 22 years soft top improvement, I would say treat it like any other car top. You will be fine!
The only issue I ever had with the top (and have with my new Z4) is cat hairs. But I must bow down to my cat overlords.
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Golden, Colorado
Prior cars - Austin Healy Sprite, Opel GT, Triumph TR7, Camaro Z28 (3),
VW Thing, Nissan 300Z, Toyota FJ40, BMW Z3 (17 years), Audi A3, Audi TT
Current Cars - 2021 Z4 M40i and X3 30e (wifes car)
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