Today was the day our windshield wiper blades decided to give up the
ghost, and after stopping by 3 different auto part stores on our way
home we discovered that our Toyota Previa is rudely excluded from the
computer list of replacement wipers.
4 dollars worth of Rain-X solved the problem nicely. This stuff really
works. You just apply the transparent polymer to a clean and dry
surface, let it dry, and buff it in for a coat of near magical
protection.