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If you do use the dishwasher approach, just remember NOT to put it through the dry cycle. You want to air dry the cases, or the heat and moisture can cause corrosion of the Aluminum. Air dry only. Blow out passages, and dry the surface with your air hose after you take it out of the dishwasher.

I also spent a few hours with Castrol's cleaner (roughly purple colored Simple Green). This stuff works well, is less hard on your skin and lungs than brake cleaner, but it is also verrrry corrosive to Aluminum. Do NOT leave it on the metal. Wipe it down with warm water or rinse it off after scrubbing a bit.

Larry