Yeah but even though you don't need to use your wipers in the rain, when the windshield gets dirty, you'd have to turn on your wipers and they don't work properly.

I noticed that I get this film that gets left back when the wipers wipe and come up.
You know like when the wipers wipe and they're vertical? Exactly where it ends there, there is this white thing it leaves back. Do you guys know what that is?