Have you ever said why not! I was watching a show Fit2Stitch and she was talking about leather, how it's washable. Well my leather sofa and chair are a mess, so I have nothing to lose, so into the wash the leather covers go from the chair, and did I forget to tell you , that it can go in the dryer.
So I just close my eyes turn the washer on and say a few "hail Mary's" , then into the dryer on low... you guessed it ! NO it didn't fall apart , but it worked the leather was cleaner and looked fresher. So I did the last of the cushions, this morning. Now I don't recommend this for the faint of heart, but if you were like me and had nothing to lose "why not".
One day there will be a new lounge suite.
What washing liquid/powder did you use?
The leather would have been treated this way at the beginning.