Will this work for a visor on a bike helmet?¡

I deleted my previous answer. I've tried three products so far and this one is, in fact, the best. I apply it liberally, let it dry, then very gently in a circular motion I rub until the lens is clear. Use a microfiber cloth. And the lens will get clear. You will be able to drive for quite awhile but condensation will start forming where your nose blows on the visor. Eventually you will not be able to see the instruments as you glance down but you will be able to see the road clearly. Other products still fog up the visor at low speed and you need to continually lift it, especially when stopped. So this is much superior.

Could this be used on eyeglasses?

If you don’t have any kind of coating for your glasses, it would work. Many anti-fog sprays contain chemicals that can eat away at anti-glare and scratch coatings. There are anti-fog wipes out there specifically for glasses with those kind of coatings

How effective is this product on bathroom mirrors?

Works great to keep them steam free, but it does cause water drops. The precip has to go somewhere. I love it though, because I can SEE.

does this product leave a film on the glass

It will leave streaks if you apply it without completely cleaning the windshield first. If you are a smoker, like me, that means 2-3 applications of windex and let it completely dry off. I park facing the sun to be sure the windshield is totally clean.

Product Dimensions	4.75 x 8.26 x 24.13 cm; 322.05 g
Scent Name	Unscented
Color	colorless
Included Components	Anti-fog for interior glass
Special Features	Antibacterial

Rain-X インテリアグラス アンチフォグ 355ml 630046 - スプレーして拭くだけ 汚れも落としてくもりを防ぐ – 車内の窓ガラスとミラーのくもり止め、自動車、ご家庭、船舶などで使用可

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Rain-X インテリアグラスアンチフォグ 355ml 630046 - スプレーして拭くだけ汚れも落としてくもりを防ぐ – 車内の窓ガラスとミラーのくもり止め、自動車、ご家庭、船舶などで使用可