Might have to google this one. I use a wax formulated for high gloss fiberglass on my camper, found it in the boat section of our local fleet store, works pretty good for me. Be interested to hear what other people are using as well....
2015 Rushmore Springfield
Disc Brake upgrade, Goodyear G614 tire upgrade
RV FLEX-ARMOR roof, Mor-Ryde IS suspension
Wax on oxidation just won't remove it by itself. I use Simoniz polishing compound. It has enough grit to clean the surface without damaging it. Test a small area first to ensure you get the preferred result.
You will be shocked at how well it works.
Don't use their rubbing compound as it has more grit and can damage your surface if not careful. Unless of course the surface is really bad, then it can also help.