Is Retr0bright useful on yellowing semi-transparent plastics?

[Huxley]

As some of you guys already know, I was lucky enough to recently pick up a "Blue and White" PowerMac G3, one of my personal 'dream machines' from my youth. Unfortunately, the years haven't been super kind to the semi-transparent parts of the machine, leaving it closer to being a "Blue and Yellow G3" than I'd like. I've never done any Retr0bright, but I'm sorta tempted to try it on the removable handles of this G3, in the hopes of getting them back to their former bright whiteish / opaque color, rather than the slightly "sickly yellow" they're currently sporting. Has anyone tried this on these plastics before? Any feedback?

 

[Unknown_K]

Are you sure the plastics are yellowed and it isn't just coated in cigarette smoke?

I have never seen a yellowed B&W.

 

[Huxley]

Are you sure the plastics are yellowed and it isn't just coated in cigarette smoke?

I have never seen a yellowed B&W.

Totally valid question. To be fair, the plastics aren't horribly yellowed - they just aren't really "white" anymore - almost like a butter color now. Thankfully I don't detect a whiff of cigarette smell from the machine (I can't stand the smell and my wife is even more sensitive than I am - she would've detected it instantly and ordered the machine out of our apartment!), so I just assumed they're yellowing with age. 

Given that the handles are easy to detach, I've already removed them and given them a quick wash in my sink - maybe I'll try a more intense sink-wash next...