Swiss chard is a popular green vegetable that can be eaten fresh or cooked. To clean it, you will need to remove the dirt, debris, and other harmful elements. To start, you will need to wash the chard in a large pot of water. Once it is clean, you will need to dry it off. Next, you will need to remove the tough stems and leaves. Finally, you will need to cut the chard into small pieces and add them to the pot of water. Once everything is mixed together, bring the pot of water to a boil and cook the chard for about 10 minutes or until it is tender. Serve hot!