I had the same problem, mine were pretty bad......I googled all possible solutions and came up with an inexpensive way to fix them ....go to any auto parts store and buy 4 different grades of "WET SANDING PAPER" 800-1000-1500-2000.
if your haze is not that bad start with 1000, take your timer and make sure you wet sand evenly and make sure there is plenty of water ( use a hand sprayer ) once you are done with each grade of sanding finish off with the 2000.
this is when you will apply the "plastic polish" and BINGO! brand new head lights!

Mine were horrible it looked like some one driped acid on them, after a good 3 hours of elbow grease they looked brand new! good luck to all !