I just semi-cleaned my engine compartment yesterday. I used some WD 40 to cut through some grease(?) or grime that was on the valve cover and on the manifold. Finished at night, so haven't seen it in the daylight.

What the heck do dealers / detailers use to make everything shine like a new car? I have had my car's detailed and they come out with a spotless engine compartment, full of shine and lasts for a while... Can't be armor all in the engine compartment...silicone spray? Anyone knows...

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1995 E320 smoke silver / parchment