I have used tail lights lens like that and they look as good as new.
1. I wash them and clean them really well with soap and water.
2. Then I lightly sanded them inside and out.
3. I then cleaned them very well, no dirt, dust, sand or grit using Dupli Color prep wipe or prep spray grease and wax remover...it's safe on plastics.
4. I then used clear, red tinted spray paint from a hobby store. I used the fake "stain glass" paint for outside windows (red clean candy spray paint will work just as well) It's fade and water resistant. I give it a very light coat on each side of the lens, let it dry, repeat till you get a color you like. I check with a drop light and see how the light shines through it. After 2 or 3 or 4 coats I would let it dry over night.
5. The next day I would wet sand it as smooth as silk, check the color once more, apply more if needed after cleaning them again with the grease and wax remover (your hands have oils on them) let them dry and wet sand them again.
6. Once I have them the color and smoothness that makes me happy I would then clear coat it, 2 or 3 coats then let it dry a few days and then gently buff till shinny.
Most people can't tell they were faded out crap lenses. They shine red and last for years. You can even save lens that are cracked and split but you have to fill the crack with a clear epoxy first then do the sanding then painting. You will be surprised how well they will look.
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