Condition your sofa according to the humidity where you live. Aniline leather will become dry and possibly crack if not conditioned regularly. Humid areas may require only one or two conditioning treatments per year as opposed to dry places--such as the desert--where six applications a year may be beneficial. Check with your local leather specialist if you are unsure about how often to condition your sofa. Only use a leather conditioner that is specifically designed to condition aniline leather, also called non-pigmented or unfinished leather.
Gently wipe the sofa with a clean, dry cloth periodically to wipe dust away from the leather so it doesn't seep in. Do not rub the sofa as that will push soil into the leather which will lead to stains or scratches.
Wipe spills away from the leather, carefully avoiding pushing the liquid into the leather. Use a clean, soft, dry cloth. Do not use water, cleansers or soaps as they will likely cause further damage and additional staining. If a cleanser is needed, use one that is specifically designed to treat aniline leather so it has the proper pH.