Last night a beloved passenger started eating directly behind me. Since I could hear it crunching (meaning crumbs), in my kindest tone, I said, "please do not eat in my vehicle. I don't have time to clean between passengers." She said, "Sorry and I hear wrappers crumpling up." After dropping the pax off, I see a granola bar wrapper on the seat, so I beep the horn and call out the window that she dropped something. She walks back to the vehicle and I reach out and put her trash in her hand. Then I thanked her for not littering!