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Markus, I would bet your 911 came with the built in windshield wipers. And if you only wash it once a year you are abusing it. Drive it more and wash it!
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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