Ok, now go get the water hose and sprayer and get to spraying. WHOOSH!!!
All of the nooks and greasy crannies!
Then get the battery tray really good. It looked like cookie monster had eaten dinner in mine. Crust and crumbs everywhere.
While you're at it, spray the outside black area too.
And squirt the grasshoppers out of your radiator. Feed them to the cats.
One more thing. You're bound to notice a little paint coming off. It's likely that this paint was flaky anyway and would fall off by itself. It's not from the simple green, more from the water pressure and lack of oil and grime holding it on anymore. Don't fret. Eventually we'll paint the engine anyway, right? (lofty goals!)
And you might just get to see little treasures like this that have lived buried in muck for ages.
or this