I have the same sensor and did this routine today while changing my air filter. It is not necessary to remove the sensor element from the MAF tube. Detaching the whole unit from the intake pipe, and using the straw from the CRC MAF cleaner spray, gives you complete coverage.

__________________
2008 E350 4matic / Black/Anthracite

------------------------------------
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