I used this to remove some haze on our second-hand caravan, assume a sticker had been removed. After a few applications the haze has almost gone.
What was better was I used it to remove a burn in the bathroom sink. First I used wet and dry, then Fenwicks. You can't tell there was ever a burn mark. Result!. Just need see if it will get rid of the discolouring in the sink, I guess it will