i tried sanding them and the i used 3m rubbing compund the buff and still have scratches.. how do i take off the scratch and stuuf and make my headlights crystal clear?

Sanding headlights huh? Do you have a sealed beam or a light housing? If you have a sealed beam just replace the lightbulbs. If not try starting with 1000 grit and wetsanding. Then work down from that to 2000 grit, then 2500 or finer. Thats the only way I can think of. I polish aluminum this way. Have no idea if it will work on plastic