Rain-X
I also use Rain-X, which works really well. Only advice would be try on an old visor or unseen area of your current visor first, as it has been reported as damaging some, although I've never had any problems on my Arai visors (clear and tinted).
Make sure you follow the instructions and buff the surface after applying, and you shouldn't get any distortion or crazing in the sun.
Paul
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