anyone know how to clean leather couch?

vacuum it first with the brush attachment, get into the creases where the crumbs live. then a microfibre cloth barely damp with water and a few drops of mild soap, wring it out so it's not wet, and wipe a section at a time. dry it off with a second cloth as you go. test on the back or underneath first. some leathers, the soft unfinished kind, darken with any water at all. finish with a leather conditioner once it's dry. skip vinegar, baby wipes and anything with alcohol, they dry it out over time.