I used the CRC Cleaner this past weekend. I suppose it works on very sensitive parts, but I noticed when I accidently sprayed a bit on a slightly dirty part of my index finger, the dirt was still there.

I think if you have the wire sensor, which will burn off residue, you can get away with a harsher cleaner. If you have the flat film sensor, which I have, you don;t want any residue left behind.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black