Replaced the blades with Bosch, pretty sure the same as you identified here. No problems whatsoever I think the Bosch stamp was different than the units that came on the car otherwise no difference.
I am surprised you have had issues maybe the entire blade is bad and not just the rubber, many years ago I bought the entire blades from pelican parts.
Thanks for the judder tips. I;m really not too much ofof a DIY guy so the steps needed... hmm.. my stock porsche blades lasted close to 3.5 years at least with no issues and no maintenance. I just want to go back to that convenience.
I replace blades annually and use Rain X, when I do track days if it rains I do not want to compromise safety, it only cost me about $20 for the refills.
I just echo what one of the posts in that link suggested - clay your windshield. That will remove the baked in crud off the glass - and clean glass and clean wipers work very nicely together. I tried RainX twice - both times (years apart) I came to the conclusion that it doesn't work well with wiper blades. Clay will remove it. Another product that can be used is "cerium oxide" (google it) - it's a soft mineral. Harder than dirt, softer than glass. I have a jar of it I've had for at least 45 years - and it's the final thing I'll try if I have any judder in the wipers. It's commonly used by detail shops for buffing out scratches in windshields caused by a broken wiper blade. Amazon.com: cerium oxide
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