I tried to get before and after pics, but they didn’t really show the difference clearly. The lights were pretty hazy with a definite yellow tint. It took some time, but the haze completely polished out. I also had some Meguires plastic polish, but I think it was past its prime and didn’t work as well.
This shot of the unpolished lens on the left and polished on the right gives you a pretty good indication of the difference.
Oh, and I also cleaned untold years worth of grime off the steering wheel controls. I thought some of the white lettering had been rubbed off at first. But, no, the sticky black grime was just covering them up.
All of that black on the cloth was from those buttons, and I wasn’t even completely done when I took that pic.