Chrome Polish on Motor

I used an old toothbrush and some pigspit to lightly scrub the area (see if water or wd40 might also cut it), then wipe with an old t-shirt...
 
Simple Green and old toothbrush works well....

I'm kinda sold on Simple Green and a toothbrush, use this stuff on my car interior so you know it's good. Follow up with some S100 engine brightener.
Don't like Pig Spit, weird name.