Soapy water
masking tape
wet n dry 1200/1500
Scratch X
polish
1/ Mask around headlight to protect paint work
2/ Soak 1200/1500, start with 1200 and use plenty of water. Rub the headlight in a circular motion to remove any signs of yellowing, and to smooth the surface. (this takes a while)
3/ When happy, use 1500 to minimise the scratches from the 1200, again, the longer, the better. Use plenty of water!!
4/ Buff dry (should be hazy) When ur happy yellowing has been removed and the surface is smooth, apply Scratch X to a rag and buff. This requires quite alot of pressure, so small areas at a time is best!!
5/ Clean up the headlight and if ur happy with the results, use a polish to finish off and make it shine...if not repeat the whole process (which wont take as long as the first time)
Remember, this isnt a half hour job if ur doing it by hand, so alow some time. Trust me, its worth it