Slice a lemon in half with a paring knife.
Rub the fruit side of the lemon directly over the calcium deposit stains on your pot. Allow the lemon juice to remain on the surface for two to three minutes. Repeat this step two to three times to loosen crusty stains.
Squeeze the other lemon half over a clean nylon dish scrubber. Scrub the surface of the pot to remove calcium deposit stains. Rinse the pot with water.
Fill the pot with white vinegar to cover the remaining calcium deposit stains. Set the pot on the cooktop. Heat the vinegar over low heat for 10 minutes to warm it.
Turn the stove top off. Allow the vinegar to remain in the pot until completely cooled.
Empty the pot of all but 1/2-inch of vinegar. Sprinkle baking soda over the bristles on the nylon dish scrubber. Scrub the inside of the pot with the baking soda and vinegar to remove the remaining calcium deposits.
Rinse the inside of the cooking pot with water. Dry the pot immediately with a kitchen towel to prevent water from causing mineral deposits.