"Clay barring"? What, do you still live in the 2000s? The perforated synthetic decon towel from DIY doesnt mar the paint lol. But if your ego makes you have to polish a car even though the customer didnt pay for it or turn down business more power to you.
Not as low miles as Sizzles car but still a beaut. Not done in my shop. His shop was dirty AF and cramped but I did what I could not normally being mobile. I used DIY detail Gold standard polish, 3" orange thin pro pad with the GG3 for smaller areas and DIY yellow waffle with my GG6 for the rest...
If the customer doesnt require or want their car polished why does it matter to you? The paint is cleaned and protected. Not every one wants their car polished (wearing the clear coat down)