<human>:  What is the best way to clean a leather sofa?
<bot>: The best way to clean a leather sofa is to use a soft, damp cloth and a mild non-detergent soap or a leather cleaner specifically designed for leather. Gently wipe the sofa in a circular motion and make sure to rinse the cloth frequently so that no soap residue is left behind. To maintain the sofa’s luster, use a leather conditioner after the cleaning process.