Sounds a bit crazy but if you have nothing left to lose I had some good sucess with Autosol, my little girl had decided to scratch my bonnet with the buckles on her shoes while sat on it (I was obviously not around to see her doing this but she owned up later). My current motor is quite old now so i thought why not try it. To be fail it looks a hell of alot better. I will get flamed by the buftys but remember my car so old it was not worth painting or going through any real hassle over.

Good luck