I have a nasty whitish gray scuff obviously from one of the clowns at the dealership on the driver's side footwell near the rounded edge by the driver's side door. I cannot get it out, but so far all I have tried is Poorboy's Trim Restore. It has cleaning agents in it so I thought that if it was only dirty, this would take care of it. It didn't even make a dent in the mark. Unfortunately, it seems the plastic on the kickpanel is either scuffed or somehow discolored where contact was made with the shoe. Is there a product that will clean this up?