I would use Lexol leather cleaner. Add a very small amount to water and scrub gently with sponge. Allow to air dry slowly. This stuff creates a mild detergent solution that will also remove oils from the leather. To replace the oils, I would use Connolly's as suggested here. If the leather was more dry and in need of conditioning, I use a product from ColorPlus called "Soffener"; but again this would only be required if the leather has lost is suppleness. Go slowly and incrementally and apply only what is necessary.
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