Quick little story about Rain-X...
I drove an '85 Jeep Cherokee between 17 - 21 (biggest POS). Besides having the electrical system shorting out on me constantly because of the brake master cylinder leaking on the fuse box, and the carburetor needing to be rebuilt every few thound miles, my windshield wiper motor fried on me. I had to drive back to Dallas from Houston (visiting my father), and it was supposed to be pretty rainy in between. I decided to buy some Rain-X, throw it on the windshield, and make a run for it.
Rain-X definitely AIN'T NO REPLACEMENT for windshiled wipers... but it does work pretty damn well!!! (If you live in Texas, you know the kind of pour downs I'm talking about).