Fill the aluminum teapot with several cups of water.
Add 1 teaspoon white vinegar per cup of water you put in the teapot.
Boil the solution on the stove for several minutes.
Pour the solution down the drain and repeat the process until the burn marks are gone from inside the pot.
Dip the scrubbing brush in white vinegar and scrub the outside of the teapot until the stains are gone.
Sprinkle salt over the wet aluminum if the stains are still visible. Scrub the salt into the burnt marks until they are gone.
Rinse the aluminum teapot with clear water and dry it completely with a clean cloth.