I had a slight haze on the headlights which made the car look old. I followed the simple instructions on the product and am very happy with the results. I don't know if this works for heavy discoloration, but in my case it worked very well. I am happy with the purchase and it only took 5 minutes to get the results. You can look at the photos to see if you need it. Edit: I read in a review that after a rainy day the headlights got worse throughout the day after application. It was quite humid at night the day I applied the product and when I checked there was fog on the headlights. It's a shame I didn't see this review sooner. I tried to wipe it off and it seemed to me that the water left some marks on the headlight. I didn't feel as bad as before applying the product but compared to the photos afterwards it definitely got worse. So I covered the headlights with plastic wrap as it was supposed to rain the next day. The light stayed the same quality as that night as I didn't let the water get to the headlights. Therefore, when using the product, make sure that the headlights are not exposed to water for several days!
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