I used windex, dollar store cleaner, wipes no matter what i try never comes out clean never had a problem when i was a kid, what are you using?

Outside I generally use rain-x on the windsheild and back windows. Then invisible glass on the sides. Usually use paper towels on the outside to apply/dry.

Then I will use a microfiber towel and invisible glass on the insides and a ton of patience cause it is never perfect.