engine color also on trans ?

I wanted to stay with raw aluminum, but could not clean it to my satisfaction. Tried Simple Green and Purple Power, pressure washed - still looked stained. Beading or wire brushing didn't look right either. I wish I would have tried some spray on wheel cleaner... Ended up I decided to paint mine using Rustoleum spray bombs - Aluminum primer, aluminum color coat and top coated with low gloss clear engine enamal to reduce the sheen a bit. Pan painted same.