A layer of calcium or other mineral deposits can develop on the inside of an electric food steamer, especially in areas with hard water. Cleaning out the calcium prevents its transfer to your food and may help keep the cooker working properly. Failure to clean calcium deposits may affect the taste of your food and leave a filmy appearance on it; calcium deposits can even clog the steam ports, causing the steamer to malfunction.
Disconnect the food steamer from the power source and wait for the appliance to cool.
Remove the bowls, drip tray and any other components from the steamer and wash them thoroughly in hot, soapy water. Rinse them with water and dry them with a towel.
Pour 1 quart of vinegar into the base to the fill mark. Plug the steamer into the power outlet and turn it on for 20 minutes.
Turn the steamer off, disconnect the power and pour out the vinegar. Use a soft brush to gently scrub inside the steamer around the heating element.
Wipe the interior of the steamer with a clean, damp cloth to remove any vinegar residue.