Nice idea, but IMO amount of water condensed depends on weather and humidity so if cars do come out with some mass produced channel to put the a/c water into windshield cleaner fluid tank it will not work everywhere for sure
So nice idea but little in practicality!
OT: We used to follow the same technique at our home in Delhi. Our upstairs owner had a big a/c in one of the rooms where we had a water cooler put in downstairs. The drain pipe from the their a/c was put in our water cooler, so no need to fill it daily externally
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