I used 3M rubbing compound. Part no 03900. It says, "This product safely and effectively removes grade 1500 or finer sanding scratches, medium oxidation, coarse swirl marks or water marks, and leaves a fine finish." Basically it rubs the top layer off your paint and seems to be pretty aggressive. Works great for my problem though. If you just want "more shiny" and have light oxidation or swirl marks, a cleaner or polish might be just the thing.
Meguiars has a paint cleaner that might work for you. This will probably eat any wax you have, so you'll have to apply a wax/sealer after use.
Deep CrystalŽ System Paint Cleaner A3016 Product Information
3M makes a cleaner wax that is supposed to protect as well as clean. I haven't used it, but thought about using this instead of a separate polish and wax.
3M cleaner wax
If you get the rubbing compound, be careful with it. I've been told the next most abrasive thing is 1500 grit sandpaper. You could probably rub right through the paint where it is thin around the edges.