Polishing out lenses

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I have a vintage Onkyo TX-80 tuner amplifier i bought new in 1987, along with some other rack system components. Going to mount it all in the shop. Display has a scratch in it, i'm going to polish that one out too...
Let me know how it goes. I have a 1978 Hitachi SR-904 receiver that I rubbed the plastic lens on something when I was wiring it up. They don't make them like that anymore !