Corrosion can form on the battery terminals and/or the battery cables in your car. Too much corrosion build up can cause battery connection problems. Corrision can be cleaned and removed, which should correct the problems it causes. After cleaning the corrosion, coat the battery terminals to help prevent it from happening again.
Loosen the nut on each battery cable clamp. Lift up on the clamp from the negative terminal first, for removal, followed by removing the clamp from the positive terminal. The negative terminal is marked with a "-" icon and the positive with a "+" icon.
Examine the battery, cables and clamps for any obvious signs of damage. If any cracks or excess wear are noticed, the items should be replaced rather than cleaned.
Sprinkle a small amount of baking soda onto the terminals and clamps. Dip a battery terminal cleaning brush in water and scrub into the baking soda, so the baking soda is worked into the corrosion. If you do not have a battery terminal cleaning brush, a soft-bristled brush, such as a toothbrush will work. Alternatively, you can mix two tablespoons of baking soda into two cups water and pour directly onto the terminals, and then use the brush to scrub the mixture. However, this will make a mess in the engine compartment.
Use a clean, dry rag to wipe down the terminals and clamps. This removes the excess baking soda and dries the terminals and clamps.
Dip a cloth in a corrosion preventatitve or petroleum jelly. Rub the product into the terminals and clamps, so both are covered in a thin, even layer.
Place the positive clamp over the positive battery terminal. Place the negative clamp over the negative battery terminal. Tighten the nuts so the terminals don't move.
