Cleaning fees are usually built in to Airbnb fees, but that doesn't mean you should trash the place. Treat an Airbnb rental as you would any private guestroom. Put garbage where it belongs, and don't leave dirty dishes out – it just takes a minute to load the dishwasher or wash a few mugs by hand. On the other hand, don't make the beds or fold towels as it just makes for confusion. Any host or cleaner coming in after you leave should be able to discern at a glance what bedding has been used and what hasn't.