Depends how bad they are. I haven't done it on a 120, but with other vehicles with polycarbonate lenses, I've had decent results with cutting compound using a foam pad on a random orbital polisher on low speed (to avoid heat build up), followed by several coats of carnauba polish (for UV protection).
When I replaced my OEM glass units with Chinese plastic ones, I had them covered with a heavy duty clear wrap.
It’s totally invisible and after a few years they look as clear as they day they were fitted. They get hard frosts in the winter and 40+ in the summer, and I’ve been through scratchy bushes and loads-a-mud, and they still look good.
Maybe an option after you’ve worn your elbows low on grease, restoring them.
Here in Sand Land, this is a regular occurrence. Quick polish and you good as new....TIP - run with the lights on for a while - it heats up the plastic, which becomes softer and polishes easier...
I use 1200 grade wet and dry, followed by a good polish with T cut, works really well, takes a bit of nerve to used the wet and dry, its a little counter intuitive but it does work.
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