I have two vehicles, both of which have headlight covers which were getting cloudy and yellow. The first is a 11 year old Jeep Grand Cherokee and the other is a 7 year old Subaru Outback.The Jeep's headlights were by far the worst. I honestly though my night vision was starting to go, because I couldn't seem to see the road when I was driving at night. Then I noticed that my headlight covers were quite cloudy, so most of the light was either being blocked or scattered.I tried the headlight restoration procedure, and tried it again. I spent about a half hour rubbing each lens, and the net result was only a very slight improvement. It is hard to tell, but looking at the lenses, it almost appears that there is as much cloudiness and yellowing on the inside as on the outside.So the Jeep effort was a failure. I ended up replacing both the lenses. It cost a few bucks, but at least my night blindness seems to be cured.The Subaru lenses weren't nearly as clouded, and it was more of a light haze over the front of the lens. There was no yellowing or discoloring. The product worked great on this vehicle. I spent about 10 minutes on each headlight, and they now look very close to new. If you look very close, there is still a slight amount of haze, but nothing like when I started. And I am not sure if I just gave up too soon, or if that haze is on the inside of the lens.=== Summary ===So I am happy with the results on the Subaru, and would recommend it based on that vehicle. The Jeep was a disappointment, but to be fair, I don't think that anything was going to work on those headlight covers.The stuff takes a bit of effort to use, but nothing too bad. The abrasive pads could have been just a bit bigger, but they were OK to use. Too much bigger and they would have been too large to work around the contours of the headlight.I have treated two vehicles from the contents of the kit, and there are at least two more treatments left before any of the contents start running out. Upon opening the kit, my first thought was that I had just paid for three pieces of emery cloth and some car wax, but the two spray bottles seem to have some positive effect on the polishing. The yellow tube seems to contain something very similar to a car wax, with a little bit of polishing compound mixed it.In short, for the price, I was happy with the performance. If you own a vehicle with basket case headlights like my Jeep, forget it...just replace them.