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It's basically degradation of the plastic lens surface, ALL the solutions resort to abrading the surface away to get back to sound plastic, then polishing to a shine.
Word of caution on 'my pal did this' solutions, the plastic is sensitive to damage from many chemicals/solvents, and they can be irreparably damaged on contact, or have damage done that appears over time in the form of microcracking, and that is terminal with no recovery possible!
Best stick to a branded commercial kit.
It of course may be only a shortish term solution and need repeating. Many lenses had a coating that protected them, but once you've abraded and polished, that'll be gone, but if they've dulled already, guess there's not a lot of choice!
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