I've got an old 1 qt cast aluminum sauce pan.

I fill it with water, a half-cup of white vinegar and put it on the stove with the parts in it until it boils. Nothing grease-based can withstand this treatment no matter how dried-on or old. This works great with old hub parts that even carb-cleaner doesn't want to touch and there are a ton of nooks and crannies to get into.

Takes 4-5 minutes of boiling and it's gone. It leaves a mess as the grease floats to the top of the water and burns onto the sides of the pan above the water level. Sometimes I have to fill it again a little higher and re-boil just to clean the pan before putting it away.

This trick works with old gunked up carburetors too -better than carb cleaner, I might add.