After using rain x orange I got the light. After about 2 years i pulled the sensor to find it had completely clogged it. Cleaned it with some rubbing alcohol and reinstalled it. Filled with cheap blue and light is out.
to go with the guy who used Rain X im pretty sure i read on here when i first got my car the washer fluid system reallllllyyy dislikes any different style washer fluid in comparison to OEM fluid... i always just buy a bottle of concentrate from dealer and it last me like a year or so. Never had an issue
I've stayed away from the Rain-X, but am otherwise not fussy about what goes in the reservoir. I buy whatever's on sale at the local auto parts store: minus 35 blue, minus 40 green, summer pink...
Seven years and who knows how many dozens of bottles of washer fluid and I've also never had an issue.