Well, i tried the PlastX product manuafactured by Meguiar's and it works pretty good. My headlights are in the middle stage of decline and the product did brighten them up. I think better results would have been obtained had i performed some sanding with maybe a 600-grit wet paper prior to using the PlastX, as there seems to be some residue that it could't get off. Overall, it worked well.