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I'm not sure about lenses but I used to make perspex display cases for shops (mostly cameras shops, and timber display cases) in my own time at home and the plastics expert who supplied and folded my stuff if necessary (accurately and easier than me with a bar heater) told me the best way to polish it was with brasso, a very fine grade of polish and minimal abrasion, same as Silvo I believe, I've used both in the past.
For more serious scratches I've used toothpaste but it is rather abrasive in comparison and I wouldn't use it on a lens
As I always do, try and find a similar material to test it on for an idea of the results you can expect. Something less critical.
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