Sorry if this has been discused already, the search function doesn't work with my iPhone. My windshield streaks when it rains. It's VERY difficult to see at night when it's raining. I bought the truck used so maybe someone put RainX on it. I'd like to know how to correct it if it's factory or RainX. I am about to replace the windshield it's so bad.
Have you tried replacing the wipers yet? This usually fixes the issue unless the ones on there are so bad they actually wore grooves into the glass in which case you are screwed.