First and foremost, it is important to clean the leather as good as possible with a vacuum. Using a soft brush attachment, thoroughly clean the entire piece of furniture, ridding it of any debris, dust and other dirt.
Add a few drops of soap to a bucket of water that is enough to create a little bit of bubbles. Soak a cloth in this solution and wring dry. Using round circular motions, begin wiping the furniture making your way from one side to the other.
Note: Begin with an area that is not easily visible. If your soap solution causes discolouration (rare but minutely possible) then the damaged area can be readily hidden.
Grab a new cloth once you have used the soap solution on the entire couch. Soak and rinse this cloth in plain distilled water and wring it well. Wipe down the entire piece of furniture, getting off all the potential residue and rinsing the piece thoroughly.
Using your final cloth and keeping this one dry, and use it simply to clean and dry the furniture. Once you have completed this, you will have clean and beautiful leather furniture.