JDM Foggy headlights

OK I bought my 93 Teg with 126k miles and it has a complete JDM front end, even the core support. Well on of the 1 pc headlights is foggy and it isnt do to water, supposedly it is due to oxydation. how to restore the headlights to clear again? Sand them? Use Rubbing compound? buff the living hell out of them? damn its annoiying have one good one and one bad one. any help would be appriciated.