Plexiglass is damned difficult to polish without burning/melting, let alone keeping it optically sound once you're done.
You can try some of the consumer grade liquid polishes, but they don't work well if the surface is damaged enough to affect visibility. Clear coat polish works, but you'll need a low RPM buffer, preferably random orbital.
Don't try this with a drill adapter like you can with glass, you'll just burn the plastic.
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