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Try just warm water and a microfiber cloth....works best and leaves no residue. The seats are sealed and coated. Most conditioners don't penetrate that top surface that give the leather color. If it really dirty you can use just a cleaner like Meguiar's, Lexol, or Furniture Clinic's Ultra Cleaner. It leaves the least amount of residue and works well. I even use it on my shoes and leather jackets.