For cleaning the leaves of a Christmas cactus, you can use a damp cloth or paper towel to wipe down the leaves. Be careful not to get too much water on the plant, as it is susceptible to root rot. If the leaves are covered in dust or debris, you can also use a soft brush to gently dust them off. Avoid using harsh chemicals or detergents, as they can damage the plant. Remember to give your Christmas cactus plenty of bright, indirect sunlight and water when the top inch of soil is dry to the touch.