How to clean / polish instruments cluster lens?

Dartnut said

Believe it or not, i've used toothpaste and a soft cloth before with excellent results.
Toothpaste has a mild abrasive in it that does the trick.
Just use regular Crest or similar, and clean after with some windex.
Guaranteed to bring a smile to your face!

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Beware of windex. I cleaned an old 65 taillight lens with that and it crazed before my eyes! I dont know what was in that bottle but it was like watching something ice up in fast motion. very strange......could have been crazed before but invisible and this stuff got in the cracks and made them visible?