Question: How to clean a leather couch.
Option 0: Create a cleaning solution by mixing equal parts of water and white wine. Dip a soft cloth  in this solution and wring it out so that the cloth is damp. Wipe the entire sofa with this cloth while rinsing the cloth in the cleaning solution when necessary. Dry the sofa with a clean towel.
Option 1: Create a cleaning solution by mixing equal parts of water and white vinegar. Dip a soft cloth  in this solution and wring it out so that the cloth is damp. Wipe the entire sofa with this cloth while rinsing the cloth in the cleaning solution when necessary. Dry the sofa with a clean towel.
Answer: 1