1. I've spot cleaned oil, grease, air filter oil, etc., with brake cleaner on my BMW's brushed aluminum motorcycle engine block. Works fine but doesn't really polish it up bright. Evaporates fast and gets a lot off.
2. Wire brush and Kerosene gets brushed aluminum clean and shines some too. BMW R75/5, engine block and valve covers. Not sure if that's practical for your purposes and situation. That's my 2 cents.