Your windshield was not cleaned properly before applying the Rain-X Original. The Rain-X anti-fog formula is the only one I'd even consider using, and only because it goes on the inside of the windows. You'll also notice that waxing your windshield works better at beading rain away than Rain-X ever could. They're around the same price as you're BOSCH Icons were. I personally haven't found any blade that will outperform or outlast them - even the more expensive can't compete. They're the only ones I've ever dealt with that will hold up to literally anything, because instead of traditional rubber they use patented Dupont brand Teflon. Tip: If you do end up having to replace them this time, try to find TRICO NEOFORMS. Repeat that cleansing trick every few months to keep them working like new. A softer material removes water better but catches debris better too. In my experience, the quality of the blades depends on the quality of the rubber or Teflon from which they are made. If so, repeat with a clean portion of the rag until it wipes clean. It most likely left a black streak on it. In normal circumstances, you only need to wet an old wash rag and, lifting each blade up, grab and squeeze just the rubber blade itself and swipe all the way across it. 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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