The Step 1 megs is more of a chemical cleaner than it is abrassive swirl remover, never removed anything other than very light marring with it here. Cleans paint up quite nicely in a Klasse AIO kind of way. There now discountinued Medallion Paint cleaner had the same kind of results as well, but did not touch the swirls.
In the Megs range #9, #82 and #80 by PC are the minimum of what has been required to impact on any real swirls and marring here.