you need to look at mbworld and benzworld under the slk and c32 forums. many horror stories of water causing electrical damage due to high pressure forced in to the computer area.
no distributor like the old days. now its ecu's fuse panels and more electrics than your house!
everyone has their own way to due things but this is easily avoided by some careful cleaning around the engine compartment.
just 1 such issue. he still hasnt been able to fix his car
http://www.mbworld.org/forums/c32-am...-problems.html

heres an interesting thread http://www.benzworld.org/forums/deta...gine-wash.html