When my car arrived at the dealer at 10:30am, I showed up at the dealer at 11am to check the car over. I told them don't bother to wash it or even to remove the plastic off the seats, floor liner, interior door protection, etc. I then went to Costco in my trade-in vehicle, returned the items home and then went right back to dealer and picked up my car at 1pm.
Here are some photos of the interior with plastic, etc. still in place when I got home. Didn't realize the photos were so large.