Please dont anyone say ( TRY THE SEARCH )before you post a question that has been asked 1000 times. Not everyone knows that.You post whores...
Ok wet sand the lamps with 800 grit until all traces of film are removed. Then finish it off with a 1000 to 1200 grit paper. and unless you have a buffer you will need to compound then polish.
Warning.. be prepared to use AOLT of elbow grease. Unless

you have a DA with 800 & 1200 grit paper and a buffer like i do.
Good luck it is alot of work but man is it worth it...........