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I have also cleaned the rubber on my blades with some 000 wet-dry sandpaper. Wet it and rub both sides of it to remove grime and create a solid "point" on the edge.
Of course, just running the length of the blade between your fingernails can remove a lot of crap from the rubber edge and help them take off a lot more rain and not leave streaks as they move back and forth.
However, both of these ideas are when you simply cannot get to the store and put new blade assemblies on the car.
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