Rubbing a small amount of non-greasy leather conditioner on the blades couldn't hurt either. It also doesn't hurt to spray a little water on there while they're wiping. Once the wax dries, buff it off and immediately turn your wipers on so the finest layer of the remaining wax will coat the blades and smooth them out. Use some car wax (preferably a hydrophobic polymer blend synthetic wax) and wax the windshield same as you would the car. Only one trick I've ever learned can restore a blade once it gets dried out (as long as it's not not dry-rotted). The alcohol you cleaned them with dried the rubber up severely, so it may be too late for those blades now. When you used your wipers on this chemical it allowed everything that has been accumulating on your wiper blades to clump up and cause poor performance. Rain-X, like any chemical that sticks around, has a residual film which can attract dust and debris. It's also worth mentioning that the Bosch blades are the new flexible kind, so they do not have the rigid metal backing that would push them firmly against the glass. My wiper blades are made from a proprietary rubber blend called "FX dual rubber compound". I was able to find a list of the ingredients in Rain-ex original formula. Is it possible that the problem is simply a matter of being absolutely, 100% sure not to allow any liquid Rain-ex to come into contact with your wiper blades? Until today, I would have been one of the latter. I've read through a number of other forums, most of which seem to degenerate into the "Rain-ex will ruin your car and make you sterile" people versus the "I never have any problems, you must be doing something wrong" people. I imagine that Rain-ex contains a number of solvents, and that letting the wipers touch the Rain-ex before it dries could damage the rubber. I am fairly sure (but not 100%) that I followed Rain-ex's product instructions - which involves wiping and polishing the windshield to remove any residue after application. Is it possible that the Rain-ex has (chemically) damaged the blades? I've used Rain-ex before on my windshield, and I've never had this problem.
When I next used my windshield wipers, they were clattering and slipping like crazy across the glass, to the point where I was afraid they would damage my car! I tried wiping the blades down with some isopropyl alcohol, which left heavy black streaks on the cloth, but it didn't seem to resolve the clattering. I have also been using the Rain-ex windshield washer fluid. Recently, I washed my car, wiped down the blades, and applied Rain-ex to the windshield. I've had a set of Bosch flexible wiper blades on my car for a little over a year now, and they've always worked great.
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