Well, I'm not going to argue with you over the RainX - It works well for me so I use it.
My helmet manufacturer (HJC) says Rain-X is fine to use on their shields with some exceptions.
HJC Shield Care
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Well, I'm not going to argue with you over the RainX - It works well for me so I use it.
Yep, outside. It has only happened once in 3400 miles so it isn't much of a big deal...until I can't see at 60mph and there is no place to pull over