I use Mothers too and it seems to keep them clean for a few trips and make cleaning them in the future easier. I do inside and outside, looks great.
But in your case sounds like the car is running too rich. The dealer should test the emissions on your car to clear it as the cause of the dirty pipes.
__________________
Jim
2006 Silver Gray Metallic over Black
The "Wolf in Sheeps Clothing" is back in the USA again
1971 2002 Colorado(Light Orange)
1976 2002 Inka(Red orange, a classic)
1982 528e Blue metallic
1984 533i Burgandy
1987 325i Alpine white
1988 535is Salmon silver
1993 525iT Calypso red
1999 528iT Titanium silver
2000 M5 Titanium silver
2006 M5 Silvergray
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