Optimum FerreX Iron Remover 17 oz. Optimum FerreX is a powerful cleaner that bonds to and dissolves ferrous oxides (iron particles) from all exterior surfaces including paint, wheels, glass and chrome. This acid-free, pH-balanced iron remover protects your vehicles exterior surfaces from long term damage caused by corrosive iron deposits. In addition to removing iron deposits, Optimum FerreX Iron Remover cleanses your paint of tar and old waxes, leaving the paint clean and ready for polishing.