BWAHAHAHAHAHA :lol:
Sorry, but Audi S paint is the spawn of Satan. Prepare for HOURS of graft to see even the slightest improvement, it's a nightmare. You'll want some aggressive compounds and pads, and a lot of them. The Scholl S3 would be a good place to start, and I like the Lake Country pads so blue is the most aggressive one they do. Then you can step down to 17+ and finally 30 in the Scholl range. You'll end up with a lot of holograms at first, but persevere and you will get there.
Don't be afraid to give it some stick, but as always start with the lightest stuff and work your way up. Even though the light stuff won't touch it, but just in case