Try going to an auto supply store like Pep Boys and looking for something called Scratch Remover. Get in your color, if there is a choice. It's a paste-like compound. While you're there, think about picking up some auto body wax with light abrasives. There used to be something called Rubbing Compound No. 7.
Before going ahead with these on your faceplate, try them on an inconspicuous location, like a bottom edge, just to be sure there isn't any gross discoloration or unacceptable surface abrasion. Good luck.
Before going ahead with these on your faceplate, try them on an inconspicuous location, like a bottom edge, just to be sure there isn't any gross discoloration or unacceptable surface abrasion. Good luck.