Turn off the vehicle and remove the key
Wear gloves and safety glasses
Disconnect the negative battery cable first
Disconnect the positive battery cable second
Inspect the cables and terminals for corrosion
Mix baking soda with water
Apply the baking soda solution to the corroded areas
Scrub the terminals and cable ends with a wire brush
Clean the battery posts thoroughly
Rinse with a small amount of clean water if needed
Dry all parts completely
Reconnect the positive battery cable first
Reconnect the negative battery cable second
Tighten the connections securely
Apply battery terminal protectant or petroleum jelly if desired