Well, the car is a diesel and it does produce soemwhat more diesel soot than it should.
Couldn't be due to the catalytic converter being shot due to the turbo going bad after a deer strike..
*chuckle*
Melted out the cat convert and now tosses moresoot out than your standard TDI.
Oh, my goodness. I bet you can find a cleaning fluid that would allow you to get rid of that stuff.