windscreen wiper 
(North American windshield wiper)
noun
A power-operated device for keeping a windscreen clear of rain, typically with a rubber blade on an arm that moves in an arc.The only other unpleasant noise entering the cabin was the windscreen wiper motor....
- This woman had a friend hook up a power pack from an electric fence to the windshield wiper.
- There were no long objects inside the car, so in the end I took off one of the windscreen wiper blades, launched myself into the back of the car, grunting and swearing, poking the wiper around until I finally flipped up the lock.
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