Scuffs on leather can usually be fixed with a careful application of soap, water and leather conditioner. The cleaning methods vary slightly depending on the leather's finish.
Before attempting to remove scuff marks from leather, determine what type of leather is going to be cleaned. This can be determined by either lightly scratching the surface or placing a small drop of water on the leather. If the scratching leaves a mark or the water is absorbed, the leather is most likely unfinished. For unfinished leather, dampen a sponge, and apply a small amount of saddle soap.
When cleaning leather, use circular scrubbing to apply or remove materials. Rub the sponge on the leather until the soap has formed a light lather. Then, rinse off the lather with cool water, and dry the spot with a microfiber cloth. When the spot is dry, apply a leather polish for unfinished leather, and rub until the polish is absorbed and the mark is gone.
When cleaning finished leather, use a mild moisturizing soap, such as hand soap, instead of saddle soap. Apply the soap to a microfiber cloth, and work into a light lather on the leather surface. Rinse off the microfiber cloth with clean water, and wipe the soap suds away. After drying the surface with a microfiber cloth, apply a leather conditioner to a cotton swab, and rub into the mark. After the conditioner dries, buff the spot to obtain a light sheen.