I'm 43 years old, been washing my engines since I was 17. I have NEVER had any problem whatsoever with washing an engine. I juice it up nice with simple green, straight. (before there was simple green, I would use liquid laundry detergent, thinned with water enough to be sprayed through a squirt bottle) Let it sit, then take a soft, floppy brush and kind of wipe it down, maybe get into the nooks and crannies. Rinse with the garden hose, start it up.
Okay, I lied. My wife (before she was my wife) had a 1985 CRX SI, after a washing the check engine light would come on, maybe. After a drive cycle it was fine. My 2004 Chrys. minivan, I had the horns replaced TWICE under warrantee - according to the dealer, I was the only one EVER who had bad horns. So I looked, and when I rinsed I was flooding them with water, so after the warrantee was up, I remounted the horns in a manner that I thought would be better. Problem solved. By the way, you can eat off my engines, and, most work can be accomplished without getting dirty. Mike
1993 Bonneville SE, frame off resto in progress, will be stock except painted black & chrome t-stars, estimated finish date - spring 2009.
Cars in my "fleet": the bonny project, the bonny parts car, 1999 Olds eighty-eight LS anniversary, 2004 chrys T & C.
Husband, father of two daughters, deer hunter and lover of most things GM, (although I do like my Chrysler minivan) - but nothing comes before my girls..
I'd much rather go home after work and be with my family than do anything else..