Hello, I was wondering how do i go about degreasing the engine on my van? It's borderline dirty but i want to get at it before it gets even dirtier. Aside from the obvious fact to cover all electrical components, is there anything else i should cover prior to degreasing?

Also, what is the best effective degreaser out there? I want someting that can cut through all the grease build-up and gunk.

Thanks!