I use a leather dressing made for the leather seats of cars. It has lanolin in it like saddle soap, so it cleans and moisturizes all at once. I think that the stuff I use is made by Turtle Wax, but any of 'em will probably work as well. It comes in a pump-spray bottle but I just squirt it onto a cotton swab. Rub it with a well-moistened swab, turn it around and use the other end or replace when it gets dirty, and, after a few minutes gently wipe off the excess if there is any. Works just great and it's not sticky -- after all, who'd want to sit on sticky car seats?
Nathan