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4,701 Posts
If your shield is still on from the mid 90's, I :bow: to you my friend...I can not keep them longer then 6 months before they get scratched to hell..One real-world, first-hand data point:
I have an older (mid-90s) Arai helmet.
I use Rain-X on the shield (the standard Rain-X, made for glass). It works very well for increasing visibility through the shield in the rain.
No problems noted after years of this practice.
YMMV!