3M also makes a swirl mark remover 3M part #051131/39009. One for light colored cars , one for dark. Its available on 3M's web site.
My daughter had a black Audi A4. Nice car but it looked like it was buffed to death with a buffer. I used the 3M and it made a world of difference. Again I would remind you to make sure that what you wash your car with, the bucket, mitt, sponge have been thoroughly cleaned of any grit, that's one place that the swirls can come from.

Pat