Hi guys just bought an 03 disco w tan leather. Truck is in great shape 72k miles like new. My problem is the tan leather seats. The are a bit dirty and I want to clean them. NO matter what I use it turns them black. I tied in a small hidden area like back of rear head rest and worked fine. But as soon as I put it in the seat bottom it turns black. Lexol, griots meguires, whatever. Idk what to do or why it's happening. Anyone have this issue or know how to tackle it?