Simichrome is good
As is Flitz.
However, I tried both on a broken 'practice frame' made of mostly dark green acetate mixed with a few similar colors, and each left a visible pattern of very fine scratches.
I also tried Flitz on a shiny black plastic base part from TV set and got the same result.
Acetate is fairly soft, while the TV part was pretty hard, so I think the scratches probably show up better on dark work pieces.
ScratchX covered the scratch pattern on the practice eyeglass part, and I just recently used it on another frame, as noted above in my original post.
I have not tried it on the TV part.
On a related note, I think Flitz and Simichrome are more abrasive than they used to be, but that's just my impression. I don't have old and new to compare, so I can only rely on memory, and you know what they say about that: 'It's the first to go' 
HTH 
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Complete thread:
- FYI: Tip for polishing plastic -
FOG,
2013-05-06, 08:04
![[*]](themes/default/images/complete_thread.png "Open whole thread")
- Another -
JLF,
2013-05-06, 11:21
- Simichrome is good -
FOG,
2013-05-06, 11:43
- Simichrome is good -
Alfred John,
2013-05-06, 14:40
- Interesting - FOG, 2013-05-08, 08:13
- Simichrome is good -
Alfred John,
2013-05-06, 14:40
- Simichrome is good -
FOG,
2013-05-06, 11:43
- Meguiar's is really good stuff... -
rob,
2013-05-06, 21:48
- So, I tried it on the shiny black plastic TV base part -
FOG,
2013-05-08, 08:04
- I only use Flitz for... -
rob,
2013-05-08, 08:10
- The first time I used Flitz was on a .45/70 Ruger #1 - FOG, 2013-05-08, 08:19
- I only use Flitz for... -
rob,
2013-05-08, 08:10
- So, I tried it on the shiny black plastic TV base part -
FOG,
2013-05-08, 08:04
- Another -
JLF,
2013-05-06, 11:21