We use Meguiar's leather cleaner & then Meguiar's leather conditioner on our seats.
http://smile.amazon.com/Meguiars-G18516-Class-Leather-Cleaner/dp/B004HCM9HE/ref=sr_1_2?ie=UTF8&qid=1440077163&sr=8-2&keywords=meguiars+leather+cleaner
http://smile.amazon.com/Meguiars-G18616-Class-Leather-Conditioner/dp/B004HCS4Q4/ref=sr_1_1?ie=UTF8&qid=1440077194&sr=8-1&keywords=meguiars+leather+conditioner
They also sell one that's called "cleaner & conditioner" in the same bottle, but I prefer to buy the two different products that are each designed with a different purpose in mind.