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car wash mystery

Does anybody know why they put those plastic bags over the rear-window wiper when you go through a car wash? They don't put bags on the windshield wipers. The bags don't seem to protect the rear wiper from being covered in soapy water. And you have to pull of the wet, dripping bag yourself when you next get the chance, which is annoying...


If I had to make a guess, it would be because when the rollers or brushes or jets go over the front of the car, they would pull the windshield wipers upward, where they're designed to swing anyway. The bags might be to prevent the brushes or such from catching or spooling on the rear-window wiper and pulling it downwards to break.