1. Take pictures, 2. Take a video, and 3. If you later notice something document it as well. I don’t go nuts trying to capture every molecule but spend a minute or two as a part of my standard rental pick-up procedure now.
As I’ve shared before that has already saved me a $500 wrongful headache. Already did Step 1 and 2 when two hours later I noticed tiny windshield chip and took a pic of that too. A week+ after we returned home they sent us a bill for $500 regarding the chip. Even though I had not noticed during Step 1 or 2, I was able to go back to that footage and find that it already existed during our pick-up! And I knew exactly where to look using that picture taken 2 hours after for reference. Was able to send them what I had and they accepted.
Whether we’re using Sixt or any other, same procedure on our end.