[san rensho]

Wet sanding is extremely aggressive. I would not do that unless my paint were completely faded (which your isn't) and I did it as a last ditch effort to avoid painting.

Clay bar is not going to be aggresive enough to get rid of swirl marks. When you get it back, you won't see the swirls because he used a wax that fills the swirls temporarily, until after a couple of washes.

The way to get a good finish is progressive abrasives. Start with a mild rubbing compound, then a medium polish and then a fine polish, so it looks like high speed buffing is the one to chooes.