Originally posted by: giantpinkbunnyhead
Yeah, i wash my engine all the time. Here in Alaska, it gets dirty very quick. A few pointers...
1) Always wash a cold engine. Warm engines can result in discoloration because the water evaporates out too fast, leaving the chemicals to do a number on the finish.
2) I wrap a terry towel inbetween all my spark plug connections, so as to avoid water getting into the spark plug wells and causing a short. (Happened once before).
3) I also spray the plug wires with WD40 beforehand. It repels water and prevents it from soaking into anything.
4. I don't usually cover anything; but areas such as the alternator and big switches only gets very scarce amounts of water. I spray the hell out of everything else.
5. Don't use anything full-strength, as it too can discolor certain engine components, even if they're cold. Simple green is one. Dilute it 1:1 and it makes a great cleaner; just don't let it sit too long.
6. When you're done, a little tire dressing can really make the hoses shine!
I get excellent results with those tips.