- Introducing the ultimate protection for your indoor trainer or gym equipment. Muc-Off Sweat Protect 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 anti-corrosive layer on your bike’s frame, metal parts, and paintwork to keep the harmful effects of moisture and sweat at bay.