It's time to have that conversation. Theres one thing that literally drives everyone nuts, but in all reality can put lives at risk.
WHY DO PEOPLE GET IN THEIR CARS AND DRIVE WITHOUT CLEARING THEIR BACK WINDOWS?!
First of all, its not possible that you don't notice.
Second, How do you even back out of your driveway or parking spot?!
Third, even if you didnt notice, when you DO notice, how do you not pull over and clear it?
NOT OKAY. Rant over.