You could always use the old Vaseline trick:
Coat his windshield wipers (liberally) with Vaseline and be sure to leave a small but noticeable "smudge" in the middle of the drivers side of the windshield (so that it is directly in the drivers line of sight). His first reaction is to hit the wipers/washer to clean it off. Pretty sure what comes next is fairly self explanatory...
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