To clean battery terminals, follow these steps:

1. Safety first: Wear rubber gloves and eye protection to avoid contact with corrosive substances.
2. Disconnect the battery cables, starting with the negative (-) terminal, then the positive (+) terminal.
3. Make a cleaning paste by mixing baking soda with a little water.
4. Apply the baking soda paste to the terminals and affected areas to neutralize corrosion.
5. Use a wire brush, stiff-bristle brush, or old toothbrush to scrub the terminals and remove corrosion.
6. Rinse the area with clean water and dry thoroughly with a cloth or air compressor.
7. Optionally, apply petroleum jelly or anti-corrosion pads to the terminals to help prevent future corrosion.
8. Reconnect the battery cables, positive (+) terminal first, then negative (-).

These steps safely remove corrosion, improve battery contact, and protect terminals from further oxidation.