Ha! I don’t know, but this definitely happens. If I’m driving in mist or fog, and only want 1 wiper swipe, I’ll press the lever *down* (from the initial neutral starting position) for 1 quick wip-wap. I believe it’s the instance of pressing the lever down into this position, actually *past* the neutral ‘off’ position, that makes them wip-wap one time.
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