Leather cars seats are durable and don't require a lot of maintenance. After a few years, however, the seats can become soiled. Use leather cleaner to remove dirt and stains. Then apply a leather protectant formulated for pigmented or top-coated grain leather (the leather used for most leather car upholstery). Protectants will resist stains and make the upholstery easier to clean in the future. Choose a protection that includes conditioners to keep your leather supple.