Damp cloth here. This truck is the first vehicle I've had with leather, I used Meg's two step cleaner and conditioner on it a while back. It was greasy, stunk and after it dried out, it really dried out. Maybe I didn't follow directions well enough but it left my new black leather seats chalked. I've had it for two years now just using a damp lint free cloth once a week. It looks healthy and there's no wrinkles or cracks. Mine stays in the garage 90% of the time so I think that helps too, so just park it under a tree, shrink wrap it and never drive it again and it should be okay.
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