From what I've been heard the wiring inspection is at the dealers during the PDI process, not at the ports.
Calling any dealership a "cleaner facility" is a bit of a misnomer, and at least here at the Port of Baltimore, many (if not most?) of the W&W employees are ex-dealer techs. Additionally, the Ineos technical team spent time training the employees at the ports as well.
Removing the overhead panel is as simple as a good yank, no real instance for smudges luckily
There is no reason your vehicle shouldn't be meticulously pristine when you get it, if it isn't, it lies on the dealership to make it right for you.