MMO wont do the job. Acetone will, imo youd be better off soaking them in acetone as thats one of the stongest solvents available on the shelf. It will burn through plastic!

just be sure to be careful handling these chemicals.

Anyway, on the greasecar forum some guys have had success removing carbon from injectors with acetone and a wire brush. But they said it was a ***** and a half to remove the carbon even after having the injectors soaking for a week in acetone.

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05 E320 CDI
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2004 E55 AMG
2002 C32 AMG (#2)
1995 E300
1978 300D
1987 300D
2002 C32 AMG(blown motor :[
1981 300SD
1983 300SD
1987 300SDL
2002 Jetta TDI
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1995 S500
1993 190E 2.6
1992 190E 2.3
1985 190E 2.3 5-Speed