Wear gloves and eye protection
Turn off the vehicle and remove the key
Disconnect the negative terminal first
Disconnect the positive terminal second
Inspect the terminals for heavy corrosion or damage
Mix baking soda with water
Apply the solution to the rusty terminals
Scrub the terminals with a wire brush or battery terminal brush
Wipe away loosened corrosion with a clean cloth
Clean the cable ends the same way
Rinse lightly with a damp cloth if needed
Dry all parts completely
Apply a thin coat of petroleum jelly or terminal protectant
Reconnect the positive terminal first
Reconnect the negative terminal second
Tighten the connections securely
Test the battery and electrical system
Replace terminals or cables if corrosion is severe