Don't know if there's any spray on wipe products that'll get ride of oxidation. But I found a product that with a lot of elbow grease and time will totally remove old oxidation from fiberglass finishes. It's called "Buff Magic". Can only be bought on the internet. It's made for the fiberglass boat industry, and man does it ever do a job on RV's. If I remember, it's about $25.00 a can, not very big, but you don't use much at all. I bought a can, and with a small buffer 4" pad applied the stuff. You use very, and I mean very little on the pad. You buff until you can't see the stuff anymore. Do a small area at a time, and when your through buffing that area, wipe off with a dry towel. It'll leave a hayes, kind of like wiping off wax after it's dried. Now, if your rig is really oxidized bad, you might have to go over the same area a couple of times to get it looking really great. And after your through, you'll apply some kind of top coat, like wax to protect the finish from becoming oxidized again. Don't get in any hurry, because this is going take some time. I did my 34 foot motor home over a little more than a weeks time frame. Worked on it for about 3 to 4 hours a day. The finish on my rig before I started was just dull, I mean nothing. But when I got through, it looks like a new rig. And my is 13 years old.