I also use Rain-X glass treatment and Rain-X windshield washer fluid on all my cars with great results. I apply the Rain-X glass treatment twice/year when I wax my cars.

Watch out for the bright pink Rain-X, I found out the hard way this winter that it is only good down to 30 Deg. F. It does not state this on the container, I found out through their web site.

The other trick I do is to wash the rubber part of the wiper blade with a paper towel dunked in the windshield washer fluid at the gas station when I fill-up. People needlessly replace their wiper blades when all they need is a good cleaning.

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles