I have had nothing but good experience with Rain-X. Your windshield may not have been clean enough prior to application. Streaking can sometimes be seen with newer wiper blades if they are not clean and still have mold release on them.
rain-x is good. Heck the VW wsher concentrate has that Rain-X like stuff in it also
I have used RainX for as log as I can remember and probably even before that (something like 20+ years maybe?). I have never had problem w/ streaks; then again, I use the RainX often enough that I don’t use the wipers as the water beads-off @ ~25mph.
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