I was loading pieces of the new exhaust into the back of my Mini and wasn't paying close attention to what was happening. In a couple places the edges scraped on the plastic seat backing and side panel leaving some light colored scars in their wake.

 

Start with Armor All....if that doesn't remove
them they may be there for good. I have the
same scenario and exhaust.....

 

Thanks for the advice. I'll try it tomorrow when I get the car back from the exhaust shop. Crossing my fingers real hard!