Or...,
Try Novus 1, 2 and 3 Plastic Polish
3 is a heavy scratch remover
2 is a medium - fine scratch remover to include yellowing
1 is a nice light polish (no abrasives), gives the final polishing a new look.
Very very easy to use.
We stock it is different sizes and in kits, but is not yet on the web site.

Any questions or concerns, please let me know (I also use it on the shower doors, gauge panels, anything plastic