Why does the rainwater sheet together where my windshield wipers have recently passed, but bead together where they haven’t?

Question

[Kind of crappy visual aid](https://i.imgur.com/zrzlYkW.jpeg)

I’m sitting in my car, procrastinating going inside because of the rain, and I noticed that the rainwater is behaving differently depending on the area where the windshield wipers passed and where they haven’t.

Why is that?

In: 91

Answer 1

Wiper push water off windshield. Wiper stop on left of windshield and then go back down. When Wiper stops, many waters from all its pushing becomes one water with one purpose

Me cave man. 5yo smarter