If the scratch will catch your finger nail, it will be difficult to get out. If it can even be done. And there will be a little bit of distortion there. Even wiper scuffs can take a lot of time to get out. It must be done very slowly and with a good amount of water to keep the temp down. I have a kit that I have used for years on my old glass. But I have not had any luck removing actual scratches. It only puts a bit of the gloss back on the surface. And even that takes a lot of time.