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once upon a time I use to buy a special rain treatment for my fluid. It worked great but after it went out of business, someone told me I could just add a bit of dish soap to my fluid and it will do the same thing... reduce surface tension which is what causes the uneven film of water on the glass.
Also a very clean windshield is a must for any ofg these products to preform well. I clean the windshield (n all my windows) every now and again using denatured alcohol... the stuff you get at home depot paint department. Just dont get it on the rubber parts. You'd be surprised how much crap comes off the glass, and how clean they will look afterwards. No more glare n streaks.
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