you know how on an old car the head lights get kinda yellowish and foggy and i was wondering if there is any way to clear them up without just gettin a new lens?

Try using brasso or automotive rubbing compound. Brasso is great on all plastics . I use it on boat screens to. Good luck

I usually use the Turtle Wax band polishing compound - that works really good. I had to clear the lenses on my old ranger not to long ago.

Bakinsoda with water, could help.
Or try 3M rubbing compound, but make sure you get a low grit. http://members.cardomain.com/12311974

I Had The Same Problem, But I Just Bought A New Set Of Euro Headlights And Clear Corners. - 200$ -it Looks Awesome And They Light The Road Up Alot Better.

BLUE MAGIC METAL POLISH. this yellowish tint is caused by oxidation. this polish is designed to remove oxidation. buff it on, buff it off. repeat a couple times, and I GUARANTEE you will be in a state of shock and awe. if there is moisture on the inside however, i can tell you youll either have to drill a hole in the back, or buy new ones.