Sooner or later, it happens to everyone to find themselves with their car broken down. In some cases, a major component fails, but more often this frustrating event is caused by oxide buildup on the battery terminals. Learn to clean the corroded poles of your car's battery to avoid expenses and future worries.
Steps
Method 1 of 2: Clean with Sodium Bicarbonate
Step 1. Make sure the car is turned off
This reduces the likelihood of accidentally grounding the cables.
Step 2. Determine the terminal configuration of your battery
There are two types.
- If the terminals are on the sides, you will need an 8mm wrench to loosen both nuts.
- If the terminals are on top of the battery, you will need a 10 or 13mm wrench.
Step 3. Loosen the negative (-) cable clamp nut
Remove the cable from its seat.
-
Do the same for the positive (+) cable. If you can't get the cables out, try twisting them as you pull them towards you.
Clean Corroded Car Battery Terminals Step 3Bullet1
Step 4. Examine the battery for cracks where acid is leaking
If you find even one, you should replace the battery.
Step 5. Check the battery clamps and cables for tears
If you find a broken spot, you need to replace those components.
Step 6. Dissolve 1 tablespoon of baking soda in 250ml of boiling water
Dip an old toothbrush into the solution and scrub the top of the battery to remove corrosion deposits.
You can even soak the ends of the cables in hot water to dissolve the corrosion on them
Step 7. Use the toothbrush to scrub the battery clamps and terminals
Remember to wet it as needed with the baking soda solution.
Step 8. Rinse the battery and cables with cold water
Be sure to wash away all baking soda and corroded material. Dry the battery and pliers with a clean cloth.
Step 9. Lubricate all visible metal parts on the battery terminals and clamps
Use petroleum jelly or a specific protective spray.
Step 10. Reconnect the positive (+) cable clamp to the correct battery terminal
Tighten the nut with a wrench.
-
Repeat the step with the negative (-) terminal. Check that the terminals are tight enough by turning them by hand.
Clean Corroded Car Battery Terminals Step 10Bullet1
Method 2 of 2: Emergency Cleaning
Step 1. Store a pair of gloves and a key that fits the battery terminals in the trunk or rear seat
Step 2. Slightly loosen each terminal with the wrench
Do not remove the cables completely.
Step 3. Pour a cola-based drink over the battery from the center out in one direction only
Repeat in the opposite direction.
Step 4. Let the liquid sit for two minutes, then rinse
Tighten the terminals and try to turn the car back on.
Advice
- You can purchase a battery cleaning spray. Some are prepared with a formula that can detect the presence of acids. These products can save you time, but you need to read the directions on the bottle to use them correctly.
- You can use a wire brush or sandpaper if the deposit is too encrusted for a toothbrush.
Warnings
- You should always remove the negative lead first and reconnect last to prevent arcing.
- Remove all jewelry before working on a car. Rings and bracelets can generate electrical discharges or become entangled in the motor.
- Always wear protective clothing.
