I did a little interior cleaning this morning and used a fairly potent degreaser and it cleaned it up very well. I just sprayed on and wiped with a damp microfiber. Wherever I took the time, it got all of the dirt out of the pores and lines in the tex.

Its a commercial product but similar to the bulk degreasers you get at home depot. Zep 50 and the like.

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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6