I used the foam setting to let it sit on some really bad spots, like the reservoir bottle of different fluids, the battery and the front timing cover.
Then after a few minutes of waiting, I switched to the spray pattern and wet the whole engine bay down from all 3 sides.
More waiting.
No scrubbing later I am happy with the results.
Before.. Note the battery, brake fluid and PS fluid reservoirs....
Now the after...
Now I didn't just go right at this.
When I bought the car I removed both battery cables. Then I unplugged every connector and applied some dielectric grease to them. Then I did the spark plug wires at both ends when I replaced them.
Took me an hour to get them all. This will ensure no water caused corrosion or shorts and the like. I'd advise you to do the same.
Rinsing : I do not advise a pressure washer, I used a wand that will mix soap and water together. This wand has a small opening at the end and increased the water pressure from a garden hose. I also blasted my radiator too, getting rid of the build up between the fins and bugs off the front.
When I was done, I stared the truck, then turned on the A/C and this caused both fans to kick on. This helped dry the belts (Which being wet will squeak) to dry off faster and helped blow some of the water off. An actual drive would have been better but I was facing the sun and the wind was pretty high today.
A clean engine bay will help you spot leaks sooner. Removal of built up crud will help heat escape thru aluminum parts like the Alternator and such. It's also a matter of pride too.
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