Headlights Tarnishing

I originally had the standard chrome lined headlamps in my K12, but as time passed, particularly around the sidelight bulge, slight tarnishing, like very fine scratches or 'yellowing' started to happen to them...

These were swiftly replaced by the smoked darker coloured lights from the later micras and now the same thing has started to happen to them!!!!!

Im told it could be the polish im using but i dont think this is likley?
Is there any way to prevent this going any further or does anything exist to repair this?

Can anyone else even relate to what im talking about lol grr
 
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