I used the anti-fog years ago on one hooptie or another. I quit using it because of so-so results.
I do use original Rain-x on my exterior glass religiously, though! I have to re-apply it a lot since bugs kill its effectiveness, but when it's fresh, there's nothing like being in a Florida downpour and not having to use the wipers.
I don't recommend Rain-x for old streaked, pitted windshields, it's not worth the hassle since you'll still need to use your wipers.
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