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I have had very good luck with Zaino products, which I used for years before getting my BMW. I can't provide a comparison to the products mentioned above, but they do cause rain to bead up and seem to last at least 6 months. One nice thing is that After their polish dries, the haze can easily be buffed off by hand. Also, they have a new polish-type product that does not require any buffing at all; it just dries, and you are done.
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