It depends on how you are planning on cleaning it.
A clean and shiny engine bay is always a good thing. It's nice to work on a clean engine and it looks good.
What is NOT nice, is having an engine with all sorts of electrical malfunctions caused by water getting everywhere if you use pressurized water and/or steam to clean it.
Use a good engine cleaner spray. (don't drown the engine in it) Let it sit for while and rinse it off with a little hot water and a brush. Whipe off with a cloth afterwards.
Always check spark plug wells for water when you're done!
Works for me..
Never criticize someone until you've walked a mile in his shoes. That way, when you do, you're a mile away -and you have his shoes!
'86 300E optically converted to '95 E300 (Sold)
-Blauschwarz on silver
-17" AMG & 15" AMG for winter