If the lamps have their rear dust caps in place, they'll not be so bad internally. If you go ahead with the usual abrasives and polishing solution, be sure to treat the polished lenses with a UV stabiliser laquer otherwise you'll be repeating the job in next to no time. Not sure how many abrasive cleanups a headlamp lens will take. I doubt it's many so the re-laquering treatment is a must. You can get aerosols for around £10 in the UK.
TC.
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