As discussed in an earlier article, how to ruin your leather furniture, you have to be careful about using oil based products (i.e. mink oil and saddle soap) since they can darken your leather furniture. Leatherique is a company that offers products free of oil to moisturize and clean leather.
Two products in particular are the Rejuvenator Oil and Pristine Clean. Rejuvenator oil retails for $31.95 for 16 oz. and Pristine Clean for $21.95 for 16 oz. Both of these products can be used to clean and enhance the longevity of your favorite leather sofa or club chair.