Summarize this article in one sentence.
Cleaning stains out of leather is different than cleaning stains out of most other upholstery. However, if you notice a fresh stain, you can still use a paper towel to absorb the moisture. Dab at the stain, but don't wipe so you don't spread the stain around. If you are able to, locate the zipper on your chair and take the stuffing out. The stain has likely reached the stuffing, and if so the smell will linger there the most. If you do not have a zipper that lets you remove the stuffing, you can still follow the next step, but you may want to act as quickly as possible so the stain does not have time to settle into the stuffing. Use just a small amount on a sponge or pad and rub in a circular motion, covering the entire chair not just the stain spot. Anytime you wash or clean leather, you must wash the entire cushion, even up to the edges, so you don't end up with a "water stain." You want the leather to dry evenly so there is no single spot that sticks out. "Nature's Miracle" is a popular, all-surface cleaner to remove pet-related urine stains because it effectively breaks down the damaging chemical properties of the urine. If you have suede, nubuck, or unfinished leather it is recommended that you use cleaners specifically designed for those materials. They will likely be damaged or discolored if the wrong cleaner is used. Try your cleaner on a discreet area of your leather furniture to observe its effects before fully applying it - this will let you know if there will be any adverse effects. Use an enzyme or bacteria-based cleaner and wash the stuffing gently by hand in a sink or bathtub. If possible, allow the stuffing to air-dry outside under sunlight which helps the stuffing dry faster while simultaneously helping the odor dissipate. Do not dry the leather under the sun, as it could bleach or harden the material. Let it dry in a cool, indoor location.

Summary:
Absorb the stain with a paper towel. Remove the stuffing. Clean the leather with a leather-specific deep cleaner. Hand-wash the stuffing. Dry the stuffing completely. Dry the leather.