Enzo Exhaust Cleaning...Trick???

The Enzo's Muffler is visible through the rear screen. Wether you are standing behind the car...or driving behind the car...you see the muffler. When an Enzo is a driven Enzo....this muffler turns brown.
Problem_____you can't get your hand to the back side of this muffler to polish/clean it. Short of removing the bumper.....or having the muffler removed periodically to polish it.... does anyone here who has
experience with this same ordeal have any suggestions or Tricks for cleaning the backside of the muffler? After 4 years....I'm tired of looking at this thing. Any Help from SOMEONE WHO KNOWS......would be much appreciated.. Thanks.