I've had mixed experiences with retr0bright, I urge caution. It does what is advertised, but my problems have largely revolved around inconsistent de-yellowing resulting in blotchiness or streaking.

The typical recipes generate a sort of gel material, which if not mixed uniformly will not produce uniform results. Same problem with both uniform application and uniform exposure to UV/sunlight. In the future, I plan to try leaving out the gelling agents and mixing up enough to completely submerge the target plastic.

YMMV of course, just my suggestions from the couple batches I've made.