Use cotton swabs and a cleaning solution such as isopropyl alcohol, baking soda and water, or even vinegar to
clean it. Gently apply the solution to the affected area and wipe back and forth until the
corrosion is removed. If necessary, leave some of the solution on the
corroded area and wipe it off later.
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Thoroughly mix a tablespoon of baking soda with a cup of hot water. With an old toothbrush, dip you brush into this solution and scrub at the corrosion. If the corrosion is too hard to remove, consider buying a battery terminal cleaner brush. Completely dry the battery.Oct 6, 2020
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On the mild side, a mild acid like vinegar can be used, and other agents are offered for battery terminal cleaning, such as baking soda. Regardless of the cleaning material, care should be taken to rinse it off. A cleaner strong enough to remove rust could continue to work on unintended metal surfaces.