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I tried the anti-fog rainx many years ago. I had a small Nissan with no AC and in the winter it would fog up badly. I regretted applying the anti-fog stuff from day one. Instead of fog each morning the windows would be covered in ice on the INSIDE. I had to scrape the INSIDE of the windows for weeks before the treatment wore off. NEVER AGAIN. Maybe in warm climates it might help but not sub-freezing areas.
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