My mom was throwing way her leather couch and I just couldn't let the leather go with it. It is super nice 3-4oz and for a couch that's almost 15 years old, it's an amazing shape. So my question is, what is the best way to clean it considering over the years there have been pets and a short time of indoor smoking cigarettes? I would like to get it as clean as possible so I can repurpose it.