copied from scottwax
1. Make sure engine is warm, but not hot. Cold engines are harder to remove grease and oil from.
2. Cover your distributor (if you do not know what or where it is, get a manual for your car), alternator and fuse box. Most electronics under your hood are adequately sealed for rain water splashing up on them, but high pressure water is another story.
3. Cut Simple Green 50/50 with water and spray liberally all over your engine and engine bay. Let it sit for about 5 minutes. If your engine is really dirty, then after the 5 minutes, spray it down again and wait an additional 5 minutes.
4. Spray the engine and engine bay with high pressure rinse water-but even though your distributer may be covered, still use lower pressure around it to be on the safe side.
5. Any remaining grime, spray again with 50/50 cut of Simple Green, and use a stiff brush if needed. Rinse again.
6. Remove the plastic coverings and start the engine. Let it run until it is dry. You will have to dry the painted surfaces in the engine bay and the underside of the hood with a towel.
7. Dress any hoses, etc you want with rubber/vinyl dressing.
8. Grab total strangers off the street and force them to admire your clean engine.
