Here is a pretty good resource on engine detailing:
http://www.peachparts.com/diy/detailing/detailing.php?location=25
As long as you don't spray water directly at the electronics you should be fine. The m111 (like the m104) doesn't have a distributor to worry about so that helps.
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Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE
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