Reiny,
I agree!! That engine bay looks clean!!
I prefer the PPG product Acryli-Clean DX-330. It is ok on any paint surface. It removes grease, wax, and tar. Leaves a paintable, clean surface. It does strip off any wax on your paint, so if you get it on the fender or hood, it will not hurt it, but you will need to rewax.
Rob