Just tried the autosol metal polish and it does indeed work!
Was doing it by hand but it took a lot of elbow grease and about 30 mins per light. I used a foam pad to work the autosol in circular motion then leave to dry for a few mins and wiped off with a microfibre cloth.
You will want to get quite a bit of the compound on the lense and keep working it around until it starts to dry, leave for a few mins and wipe off. Repeat as many times as is necessary! I repeated about 10 times per light and was sweatin like a pig lol....
Will post some pics tommorow but unfortunatly did not take any before I done them, but believe me, they were bad!