The other day I was working in the car and sweating like a pig. When I was done, it didn't occur to me to wipe the seat down. Now the leather of the passenger seat has gone all hard in areas. I've been trying to fix it with some leather conditioner, and it seems to be helping a little, but not as much as I'd like.

Anyone have any ideas on how I can better repair this? Or should I just keep on with the leather conditioner? And does someone have a recommendation for leather conditioner? I've been using Meguiar's Gold Class Rich Leather Cleaner/Conditioner, but there seem to be some specialty products out there that imply that most, if not all, of the retail products are either useless or actively bad.