I have to add I don'treally care at all for those retail kits. I've tried a couple of them and it was a waste of money and lots of elbow grease-frustration. My fingers ached from those little multi-colored abrasive pads you haev to use and they hardly make a dent.

The solution was to go with some tips from another forum and you get really serious about it!

You start by taping-off the entire lens from the body area really well, then:

1-Go at it with a small, hand-held electric orbital sander with 400 grit wet and dry and a trickle of water while you sand. Don't freak out! It's going to cloud the lens completely. Just be sure you are thorough and get every edge and nook sanded completely and uniformly.

2-Next, hit it with 800 wet and dry and the sander, water trickle, etc., and go until the surface is uniform.

-Use long, smooth strokes back and forth across the entire width of the lens surface until uniform.

3-Next, same thing with 2000 grit paper.

-Wash and rinse with a little soap and water to get rid of sanding grime and any loose abrasives.

4-Finally, hit it with a buffer or moist buffer bonnet on a drill and use a Heavy Duty scratch removing polishing compound like simple Turtle Wax, wipe off and then a lighter polishing compound, like TW, with the buffer.

The lenses on my 2004 coupe look brand spanking-new! I not only eliminated the fog and yellowing, but took out a lot of scratches and dings. And all told, it took less time than the commercially available kits that don't work and cost on average around $20 a pop.