Well while I agree with @Andy S comments, take time to have a look at your local car detainers. It will cost you more but you will get a far better job than the dealership offer. 99% of such dealership detailing is farmed out.
Here is an example of what a top detailer offers. This is local to me. Clean Detail
Who offer New car protection prices
Have a read through the site and use this as a bench mark of what you want to look for in your area.
Joss
Current car: BMW X2 sDrive 20i M Sport 5dr Step Auto In metallic Portimão Blue. 04:10:2025
Previous car:Peugeot 308 GT Premium 1.2 Pure tech Petrol.