Scott, I had the same problem as you, my M6 also got the free swirl marks from the dealer. Their bodyshop worked on it to make it better but I can still see the swirls.
Jngbrdman, is there a good SMR you recommend to use by hand that I can find easily in auto supply stores? Mother's? 3M? Meguiar's #9? Or should I just get a PC and go at it?