No, you should not use Dawn dish soap on leather furniture. While Dawn is a gentle soap that is safe for many types of surfaces, it is not designed for use on leather. Leather is a natural material that needs to be treated with care in order to maintain its appearance and durability. Using a harsh soap like Dawn can strip away the natural oils from the leather, causing it to become dry and brittle over time. If you need to clean your leather furniture, there are specialised leather cleaners that you can purchase which will do a much better job at cleansing without damaging the material.