Today I drove with my new 453er convertible about 5 km on rainy road. This short ride led to so much dirt on the rear window that you could not look through. Logically, the cover is similarly dirty. (The predecessor, the 451er convertible, did not have this problem). I don’t want to hang any rubber flaps behind the rear wheels now, that certainly looks sour and I don’t even know how to fix them. Do I have to live with it in the future? Or has ever If yes, please info, how…