Good question. IMO i will hard spray the car off when i get it home and that evening will clay it using a soapy solution. Dealer has intruction to not detail! On black cars they are the worst offenders of creating the swirls before you drive off the lot.
I agree, wash it yourself until you can feel the surface as smooth with little dirt as possible, then use the clay bar.
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For I know the plans I have for you," declares the LORD, "plans to prosper you and not to harm you, plans to give you hope and a future. You will seek me and find me when you seek me with all your heart.