I took an Uber yesterday and the driver had some kind of little square thing on her ac vent outlet that let out a chemically fragrance that was so overpowering I wasn't sure I could make it through the ride. Nice driver who I'm sure is doing her best but PLEASE people: Uber doesn't want your car to SMELL like ANYTHING. If your car has an odor change the cabin air filter and replace it with some that has a charcoal component present. Do NOT use anything that is going to asphyxiate your customer. I left this driver 5 stars but did not tip her. Guess I should have told her why but jeez I felt like I might not make it through the ride without a respirator. It was REALLY that strong. Unbearable.