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I find that RainX makes the water start moving at 55 mph. A carnauba wax or paint sealant will make the water start moving at 35 mph. Just apply the wax thinly to the windshield, allow to dry 20 minutes and remove. There will be no chatter.
SiO2 sealant spray does a great job too, and all you do is spray and rinse.
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