Sprinkle baking soda across the bottom of the pan.
Fill the pan with enough white vinegar to cover the burnt residue.
Heat the pan on the stove until the liquid inside begins to boil. Allow the liquid to simmer for several minutes.
Remove the pan from the stove and wait until it cools.
Squirt grease-removing liquid dish soap onto a scrub pad and use it to scrub away the burnt oil residue, which should come out fairly easily.
Rinse and dry the pan.
Stir 2 tablespoons of cream of tartar into 1 quart of warm water.
Pour the solution into the stained aluminum pan.
Place the pan on the stove and bring the liquid to a boil for approximately 10 minutes.
Pour out the liquid and wash the pan, after it cools, using hot, soapy water and a scrub pad.
Rinse and dry the pan.