Why you have the dealer do nothing to the exterior before ..
I just got a new black Audi A3 from Rusnak Pasadena who handles Porsches, Bentleys, Rolls Royces and Audis. I got the car one week ago and today is the first day where we have had sunshine in a week. I saw the A3 at noon, swirl and rotary buffer swirls everywhere. They waxed the car before delivery! They had four other black cars they were delivering at that time (2 Porsches, 1 Bentley, 1 Audi). I can just imagine how those cars are.
If you can, make sure your dealer does as little as possible before delivery or else you will be sorry.