This is the only leather-prepping agent of its kind. Completely safe for the environment, and will not harm leather fibres as harsh chemicals can. Yet it powerfully penetrates old, tough finishes to enable the new dye to permeate the leather, ensuring a professional finish. Prepping Agent can also be used for heavy duty cleaning, to remove silicone sealers, petrol distillates, wax, and grease. Rejuvinator Oil should be used after this to recondition the leather.