Keep your leather couch clean. Dust off the leather with a soft, dry cloth at least once a week. Wipe down the couch with a soft, damp cloth if it needs a bit more cleaning power. For deeper cleaning -- usually just a few times a year -- clean the leather couch with leather cleaner. Follow the instructions on the leather cleaner since this will vary among products.
Treat your leather couch with a leather conditioner twice a year. This will keep the fabric supple and help to prevent stains. Follow the instructions on the bottle for using the leather conditioner as this will vary among products.
Situate your leather couch in a spot that is away from direct sunlight and heat sources. Excessive heat and sunlight can cause the leather to fade. If the couch is situated near a window, put up window treatments to protect the couch from the sunlight. Sit the couch at least 2 feet away from direct heat sources.
Blot up spills or liquid from your leather couch right away. Use a soft cloth to dab at the spot without rubbing. If the spot is oily, sprinkle cornstarch on it and leave it there for a few hours to absorb the oil before brushing off the powder.