Step 1
Unplug your appliance from the wall outlet, and allow it to cool down.
Step 2
Mix equal parts white vinegar and lukewarm water in an empty sink, and put the cookware in the sink. If you want to clean heavily stained cookware, use 2 parts vinegar to 1 part water. White vinegar contains acetic acid, which reacts with calcium to dissolve it.
Step 3
Allow the cookware to sit for 20 minutes. This gives the mixture time to do its work.
Step 4
Pour the mixture out, and wipe the cookware clean with a soft sponge.
Step 5
Wash it as normal.