Ginger is another effective cleansing herb for the kidneys. It can help flush toxins and harmful materials out of the kidneys as well as improve digestion. This herb is also beneficial for cleansing your liver. One of the best ways to enjoy ginger’s cleansing benefit is sipping ginger tea. To make the tea, simmer 2 teaspoons of fresh-grated ginger in 2 cups of water for 10 minutes. Strain, add honey and lemon juice as per taste, and drink it 2 or 3 times daily.