Rinseless wash is your friend for that type of situation. Should be able to clean it up in a matter of minutes without washing the entire car. I've also noticed that the mirrors will hold water if they are folded in. After washing, I'll blow them out pretty good with a leaf blower, and then I will fold them in and out a couple times. That generally takes care of the majority of the water spots you'll get from it dripping down the door.
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