Degreased my Engine Bay: Pics Inside
Using some Meguiar's Super Degreaser Ratio 4:1 and the engine slightly warm, I sprayed it down, let sit for a minute and aggitated it a bit. Sprayed with cool water and most of the grime blasted off. I hit a couple spots again and got it 90% of the way there.
I also tried out some stuff from Meguiar's called Hyper Dressing. Works wonders on Tires and the mixture was ratioed at 1:1 for the highest shine. After using it, you notice a difference for sure. I think though for Black Plastic would use Tire Shine (Gel) but this stuff makes everything look good.
Some of the photos did not come out, and I was running out of daylight. Also next time I will blow it out with a air hose too.
Before




After



Hyper Dressing



When I owned my 94 Z28 383 LT1 I would wash/clean anything in the engine bay with a rag and solvent.
I did my best to keep it away from most electrical things, plus I let the motor run for a few minutes to steam off the extra water and took a clean terry cloth to wipe up excess.
I forgot the air hose like a dummy which made it harder for the Hyper Dressing to bond with the surface.
Also you could consider IF you were replacing it, to cover the open holes on the motor and then do a clean like I did with a hose or pressure washer. Dry it completely before reinstalling the new unit.
Beleive me, it was aggrivating when my LT was dirty



