I remember a few years back, flying a brand new Boeing 737-700 (several days old) into Antigua, there was a storm overhead and tried to turn on the wipers during the approach, nothing happened. The windshield coating did not clear enough rain away for us to see safely to complete the approach, so we had to bug out and wait for the storm to pass and landed without incident, come to find out (after the mechanics looked at it)the wipers weren't hooked up at all... Dang quality control...