What kind of water repellent coating should I buy?

I can't see the windshield well when it rains, but I heard it's good to have a water-repellent coating.

I think it will cost a lot to leave it to the company, so I'd like to try it personally.

What should I buy to coat the car water-repellent?

Please recommend a product~

515 2017-07-10 Gentleman

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