I've never had a problem with RainX brand.
I haven't had luck with it on my 50. Maybe my glass has too much texture on it from being in the elements for 73 years. RainX brand washer fluid works great in my daily (13 Silverado) and I often don't need to turn the wipers on at all. I have wondered if the nose of an AD truck does weird aerodynamic things with the wind across the windshield, but I've seen others report good results with RainX in an AD, so I suspect some new clean glass would help mine.
