Non-Smoking rig, that's pretty much it.
I just try to keep it as clean as possible in my every day life and ask the same.
Regarding small incidental damage:
1) New paint chips 1/16th in diameter or larger that do not require the entire panel to be repainted are a Flat $10.00 charge.
2) If the vehicle is returned with a lingering odor (something that does not dissipate by the next morning after pickup), such as when a guest smoked in the vehicle, it's a minimum $50.00 for the extra detailing I have to do to correct the issue.
If the issue is significant and requires professional detailing, Turo supports up to a $200.00 fee.
3) If returned without filling it back up with fuel, a $5.00 surcharge will be assessed on top of whatever fuel cost is.