I have not tried rain X in about 20 years. All it did for me was make the window glare more at night. I currently use a product designed for spas/hot tubs. I only need to apply it once every 6 months or so. It is called "Spa Fast Gloss" and is put out by a company called "Leisure Time". I agree that it is an amazing difference in wet weather. Bug guts do not stick as well with it either... and that is always nice.
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