A number of specialty leather cleaners have arisen due to specific leather problems that require a focused solution. For example, mold on leather can incorporate into the leather material, requiring a specialized product to both kill it and remove it. Leather Master Mold Cleaner is such a product.
Dye transfers, such as dye rub off from blue jeans can color and mar leather. Leather Mater Dye Transfer Cleaner is a great solution to this issue.
Finally, ink removal is a very tough problem. See the discussion at the bottom of this section for advice and product selection.