To clean and polish leather shoes using a sponge, follow these steps: 1. Start by removing any dirt or debris from the surface of the shoe using a soft-bristled brush or a damp cloth. 2. Next, apply a small amount of leather cleaner to the sponge and gently rub it onto the shoe in circular motions. Be sure to cover the entire surface of the shoe, paying extra attention to any areas that are particularly dirty or stained. 3. Once you have cleaned the shoe, allow it to dry completely before moving on to the next step. 4. Now it's time to polish the shoe. Apply a small amount of shoe polish to the sponge and rub it onto the leather in circular motions. Again, be sure to cover the entire surface of the shoe. 5. Allow the polish to dry for a few minutes, then use a clean, dry sponge to buff the shoe to a shine. 6. Repeat the process on the other shoe, and you're done! Your leather shoes should now be clean and shiny.