Just an idea. . But I used Meguiar's Ultimate Compound automotive finish restorer on my c30 longbed when I bought it about 7 years ago. Granted it is white. It is in storage quite a bit of the time so not much exposure to the sun, but it has held up very well. If I remember correctly my truck took two bottles of it and I bet it was 16 microfiber rags to wipe up all the oxidation residue after I would slowly go around the truck with my Klutch polisher (using foam pads at medium speed) . Obviously no clear coat to burn through. I just like to take my time and get to know the truck
At around $9 a bottle, some rags, and if you already have an electric or air polisher . . .it's not much of an investment
or just try a spot that's not obvious and go from there. I wish I would have taken pictures before and after :/ you could have made chalk for using in the classroom with all the oxidation on my truck lol