Turtle Wax Headlight Lens Restorer
it sucks and doesn't work 
i have a bmw and i got smoked lens's ,,i car detail and there a few ways to do it,,,i worked for car dealers long time and we had a demonstrator show us and he had good stuff,,,what i did with my normal machine buffer is u get no grit sandpaper its smooth no ridges at all and regular glaze or if bad compound ,,wet sandpaper and rub till it hazes dry then buff over lens,it might take few times,,i did it with glaze it improved but i need heavier compound next time.