Wipe your leather couch down with a damp, cotton cloth. Do this as often as you dust the rest of your furniture, for good general maintenance of your leather couch.
Pour 2 tablespoons of leather cleaner into a terrycloth towel. Rub the towel gently over the leather to exfoliate the dirt, being that the towel doesn't make existing scratches worse.
Rub any stains for 30 seconds, and let it sit. After one to two minutes, wipe the residue with a fresh, damp terrycloth towel. Repeat this process as necessary if the stain is deep or has been sitting for a while.
Apply two tablespoons of leather conditioner to a clean, soft cotton cloth. Wipe the leather with the conditioner. Let it absorb for two hours before sitting on the couch.
Apply leather filler to a clean sponge. Hold the cracks of the leather together, and dab a light amount of filler into the crack.
Allow the filler to dry for five minutes.
Lightly sand the newly treated leather with fine sandpaper to remove excess filler.