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You can spend $25 on a good headlight restoration kit and spend 2-3 hours doing each headlight and still have crappy lights, and get to repeat it every 6-8 months since they will continue to yellow and get hazy.
Mine were fogged out. Bought a cheap set off ebay or rock auto $60ish as well. Held up super over the last two years, in salt country even. I tried the buffing stuff, The home brew idea's of buffing and bought the 3m buff kit. None of it holds up for very long. They always looked nice after buffing, But I just ended up wasting my time. In my opinion, Save your time and money, By the cheap lights.
I have had great success for short term improvement using toothpaste and a toothbrush. (I used crest) improved lights for around 2 months before they faded back.