NOCO's original recipe CB104 Brush-On Corrosion Compound is expertly formulated to prevent corrosion on your terminals. It's been doing it on billions of batteries for over 100 years. Simply apply to the terminal with the included brush. The oil-based formula will remain on your battery and help extend its life! Get the most out of your products by taking care of them with CB104 Brush-On Corrosion Compound.