For vinyl stripes and decals that are in good shape, I would recommend 303 Protectant. Wax is not good for vinyls and I personally threw out my Armor-All juice years ago.
If the the graphics are cracked, you can:
- Live with it
- Paint over - which leaves an "alligator skin" texture to the paint
- Remove stripes only, which will leave a "ghost" of the old stripe
- Remove and replace with new vinyl stripes
- Remove and repaint stripes
Depends what you are willing to pay and how picky you are.
Myself, I'm a cheap bugger and am more than willing to get dirty and save some bread. My striping is all wasted, so when the time and money are in alignment I plan to strip everything and do a full body repaint myself. At least that's what I keep telling myself.