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Are you doing this by hand?
Power buffers would help a LOT.
I'm not a pro at this, but we used to mess around with plastics and rubbing compounds and *Brasso*.
I'm sure the dedicated plastic polishes work, but Brasso was something that was always around, and we had to take care of a lot of brass when I used to do the ROTC thing back in high school.
-Ted
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