Even when it is raining buckets, the continual sweep of the wiper is not required. The near 90 degree angle of the rear window ensures that. I constantly turn the thing on and off..leaves streaks and starts stuttering otherwise (not enough water)..while I'm at it..the rear wash funtion i.e. the blade stops on the next stroke after you release the button...why not have it wipe 2 or 3 times more :rolleyes: