Well, I didn't want to spend a couple hundred dollars on getting the truck detailed, so when I went to the store I picked up a canister of ArmorAll leather wipes. I was hesitant to see how they would work, but it was well worth it. To clean four captain chairs, I used the whole canister which contains 20 wipes. I must admit, they turned out much better than I expected.
Here is where you can see the before. I cleaned the bottom right section so you can see the difference.