I was also wondering about wearing out the motor but I don't believe that to be an issue. And I would think the car is smart enough to stop the motor if it encounters resistance. Plus if I'm not mistaken the mirrors will fold mechanically when forced, so again I would think the ice buildup wouldn't cause too many issues. I haven't checked though so don't take my word for it.
Sorry for the double posts, just trying to find a minute here and there and don't always get my thoughts in on first try :-)
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