Muc-Off eBike Ultimate Corrosion Defense. Introducing the ultimate protection for bike batteries and components. eBike Ultra Corrosion Defense uses state of the art anti-corrosion additives and inhibitors to provide class-leading protection against corrosion. It even works on surfaces that already have rust and corrosion… it simply stops rust in its tracks. It drives out moisture and leaves a protective anticorrosive layer on your bikes frame battery casing battery terminals metal parts plastics and paintwork to keep the harmful effects of moisture at bay.