thanks guys. I'm thinking of washing the car already. Even though it looks really clean from delivery i found by accident when I rubbed my hand along the back bumper that there was alot of black soot, which I didn't notice because its on the part of the bumper that is already black.

I'm assuming the soot is from the exhuast but the exhaust tips still look really clean. Since I'm not exactly sure I will give it a clean and monitor it.

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2008 X5 3.0sd Sports
Space Grey, Camel Leather, Bamboo Trim, 214 alloys

Previous cars
2000 E46 323i Steel Blue
1997 E39 528i Oxford Green
1999 E39 535i Orient Blue
1997 E39 540i Black
2005 A170 Atoll Blue
2005 E90 325i Alpine White
2006 E53 3.0d Sports