DO NOT USE RAIN-X on your visor... I don't know about once or twice... but it will discolor the plastic. if you look at the bottle it says keep off plastic.
I used some stuff called TT-clear... didn't work as well as advertised... as long as you clean your visor at each gas stop... you'll be good... just turn your head side to side and the water will clear itself.
try not to get behind cars/trucks... the mist they kick up has alot of grime in it. that shit doesn't come off cept when you wipe it down.
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