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You are either LUCKY, or their has been a formula change. Original Rain-X even said on the bottle not to use it on plexyglass or lexan. By the way mid-90's? Your helmet has far outlasted its usefull life span. Want to see you around, so get a new lid.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!