Any ideas on what to use to clean aluminum heads?? There on the motor, just a little dingy..... trying to clean them up a bit before I drop the motor back in the boat.

mothers and a power ball or some metal serum from marine clean.

Eagle One Mag Cleaner, makes stained aluminum bright again.
works well on rims, trailers, jack plates, ect.
spray on the bottom working your way to the top, with heavy covorage to avoid streaks. then flush with lots of water before it drys.

Jeff