The state of the car (interior, exterior, cleanliness) should always be recorded at both check-in and check-out. This will be done either by you, using the Getaround app.
Make sure to thoroughly document any pre-existing damages or mess so you can avoid being held responsible. If necessary, feel free to take additional photos with your phone. Keep them for at least 30 days after your rental has ended so you can contest any cleaning fees or reports of new damage.
This article contains information specific to certain registration countries. Please refer to the international version of this article for other cases.