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If you like Rain-X, you'll love AquaPel. It lasts up to six months per treatment and is superior to Rain-X. You can buy a six-pack off eBay for a pretty reasonable price (about $4-5 per application). It not only beads the rain really well but drastically increases the clarity through the windshield when it's raining.
And before you install your new wipers one of the best things you can do for your windshield is to use some Griots Glass Polish on it. If you have an orbital buffer an application of the polish will leave your windshield like new and ready for the new wipers and some RainX or whatever.