Ethan's point about avoiding a strong spray is good. The really high pressure spray can knock some things loose..ie..connections, etc.
I use the engine cleaner spray setting, followed by the soft, spot free rinse.
Needless to say, you don't want to do this when the engine is red hot. Fortunately for me, I live just yards from a self-serve car wash.
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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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