From a professional point of view I can tell you this much:
DO NOT LET YOUR DEALER WASH/DETAIL/APPLY ANYTHING TO YOUR VEHICLE'S EXTERIOR OR INTERIOR.
A high end, reputable, professional detailer will do a much better job and use much better products.
If you are looking for the best protection for your paint, try searching for premium paint coatings such as CQuartz Finest, 22ple VX1 Pro, and Opti-Coat 2.0.
Let me know if you have any questions
Megan EZ Coilovers|Trunk Lip|Roof Spoiler|Redouts|M2 Axle Back Exhaust|CF Vinyl Interior|GFX Sides
Xenon Depot 6000k HIDs & LEDs|MRR GF07 19x8.5+35/19x10.5+40|Hankook V12 235/35 & 275/30
I <3 Detailing