Today i did a a 2001 SL500 with 26,000 miles on it.
the paint was in ok, shape.... lots of swirls but no real oxidization since it had been garage kept.
the owner paid to have it detailed befor i got to it....
the entire car was covered with bad swirl marks, as well as light scratches.
as the process moves along you can see that the paint can become like a mirrior.

not a great picture, but you get the idea.
no more swirl marks
inside came out great
wash with meguiares NXT crazy purple stuff
meguiares professinal mild clay
rewash
light swirl remover with semi agressive pad
custom blend of cleaner wax with a med pad
Menzerna finishing glaze
wolfgang paint sealant
with a few minor tricks in there to get it to pop.