system
Given the following post, respond as if you're commenting on Reddit:
human
Why don't we just coat windshields in superhydrophobic coatings instead of using windshield wipers on cars?

It's 1am and I'm tired.
gpt
Because it wears off, Andi's ineffective when dirty or in very heavy rain.

Rainx is a widely used hydrophobic compound, based on silicon that people buy and apply.

It works a treat in light rain, but in heavy rain or at very low speeds still needs windscreen wipers.