Muc-Off Harsh Conditions Barrier (HCB-1) uses a state-of-the-art, thin film coating to give your bike long term protection against rust and corrosion. It even works on surfaces that already have rust… it simply stops rust in its tracks, removing it altogether! Particularly effective in very harsh conditions, our formula is ideal for protecting your two-wheeled toy over the winter months when large amounts of road salts are out on the roads.