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You know better. This sentense doesn't have double sense and much probably he is talking not to a horse. Because I've never seen horse that can clean up glasses. Whom he is talking with perhaps you...

So it means that the horse must take brush, come to windshield and clean it up…

Using capitalized letter in "вы" is not so necessary. You use it when you want to underline your respect to...

"Н-но, протри ветровые стёкла!"

"Н-но" usually is a statement spoken to a horse to force it to go. In this case it is applied to a man, that is not very polite. "Протри" is from "тереть" (rub)....