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How to Clean Corroded Car Battery?

Car batteries are one of the essential parts of a car. However, like most things, they can develop corrosion. This corrosion can create problems with the battery, such as reduced battery life or even an inability to start the car. Fortunately, there are a few simple steps you can take to clean corroded car batteries. This guide will walk you through the process, and by the end, you will clean corroded car batteries effectively and safely.

How to Clean Corroded Car Battery terminals step-by-step guide

1. Wrench:

The first step is to get a wrench that will fit the circumference of your battery. This will help you loosen and remove corrosion buildup.

2. Baking Soda With Hot Water or Battery Cleaner:

Once you have the wrench, put it on the battery and turn it so that the opening is facing downwards. Add 1 part of baking soda to 10 parts of hot water or battery cleaner. Pump the mixture until it is bubbly and then pour over your battery.

3. Battery Terminal Cleaner Brush or Old Toothbrush:

Once the battery is covered in baking soda and hot water, use a battery terminal cleaner brush or an old toothbrush to scrub it clean. Apply pressure while scrubbing to get into any tight crevices.

4. Cool Water:

After washing the battery, wash it off with cold water. This will help prevent further corrosion and baking soda which can form on the car’s metal parts that might not be visible to you.

5. Towel, Cloth, or Air Compressor:

Once the battery is clean, towel it off and then dry it off. Wind the cloth around the battery a few times to help spin any water droplets that may still hang on. Finally, use an air compressor to blow out any residual moisture.

6. Petroleum Jelly, Terminal Protection Spray, or Anti-Corrosion Pads:

Finally, if you notice any rust or corrosion developing on the battery terminals again, apply a thin layer of petroleum jelly, terminal protection spray, or anti-corrosion pads. Be sure to read the directions and follow them closely so that your car’s battery will stay in good condition for years to come.

Step-by-Step Instructions

Step 1: Ensure That Your Car Had Been Turned Off

Before working on your car’s battery, it is important to ensure that it had been turned off. Otherwise, you may end up doing more harm than good.

Step 2: Remove the Cables, Working on the Negative One First

The first step is to remove the cables from the battery. First, loosen the connector clamps on either side of the battery and then pull them off. Use a cable tie or clamp to keep everything in place while you work.

Step 3: Check the Car Battery for Any Damages

Once the cables are out of the way, it is time to look at the battery itself. Make sure that there are no cracks or damage anywhere on the cell and then check to see if there are any signs of corrosion.

Step 4: Check the Car Battery Cables and Clamps for Any Damage

If there are any signs of damage, be sure to replace the cables and clamps as needed. Once everything is checked and repaired if necessary, re-attach the connectors to the battery positive terminal and then tighten everything down using the clamp.

Step 5: Clean off the Corrosion With a Cleaning Agent or Baking Soda With Hot Water

If there is any visible corrosion, you will need to clean it off with a cleaning agent or baking soda and hot water. Be sure to use soap and water and avoid using harsh chemicals.

Step 6: Rinse the Car Battery and Cables

After cleaning, it is time to rinse the battery and cables off. Fill a large bowl or bucket with cold water and dump in the battery. Swish it around to rinse off all the chemicals and then let it sit for a few minutes so that any excess water can drain away.

Step 7: Dry the Battery

Once the battery is rinsed and drained, it is time to dry it off. Grab a large towel or some newspaper and place it on top of the battery. Use another towel to help press down on the newspaper so that all the water can be absorbed.

Step 8: Apply Petroleum Jelly, Terminal Protection Spray, or Anti-Corrosion Pads

If you want to add terminal protection, spray it on with a Petroleum Jelly, Terminal Protection Spray, or Anti-Corrosion Pads. Be sure to apply it generously and avoid getting it in contact with the battery’s metal casing.

Step 9: Reconnect the Cables, Starting With the Positive Cable

First, reconnect the positive cable. Plug it in to the battery Positive terminal and tighten down using the clamp.

Next, connect the negative cable. Again, plug it in to the battery Negative terminal and tighten down using the clamp.

At last, add a little of zip-tie to help keep the connections together and then tighten down everything with your wrench.

How do I know if my car battery is corroded?

If your car battery shows any yellow or brown discoloration, it is likely corroded and needs to be replaced. If your battery has brown or yellowish-brown stains, it likely needs to be replaced.

Don’t bother replacing the old car batteries if you see any signs of corrosion, because they won’t last long before going out again. Your best bet is to purchase a new sealed lead acid battery unless you have a deep cycle gel cell in there somewhere (but then chances are good that it’s worn down enough).

How do I clean this off the car battery?

If you just want to remove the water droplets from your car battery without actually cleaning it, just use a towel or piece of newspaper. Just be prepared to apply more pressure if needed to absorb all the water.


After completing these steps, your car battery should now be much more resistant to corrosion and ready for use. Always consult your vehicle’s owner’s manual before doing any work on your car and use the correct tools and techniques when working on a battery. If you have questions about this guide, please leave a comment on or contact us at our toll-free number. Thank you!



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