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Car battery corrosion can be a common and frustrating issue for many vehicle owners. This corrosive buildup not only looks unsightly but can also hinder your battery’s performance. In this article, we will explore the causes of car battery corrosion, what it looks like, things to watch out for when attempting to remove it, and how you can effectively clean it using common household items, like baking soda and lukewarm water. If you’re uncertain about cleaning your car battery, you can always rely on professionals, such as Battery4U, for assistance in safely maintaining your battery.

What Causes Car Battery Corrosion?

Corrosion on car batteries primarily occurs due to the escape of hydrogen gas during the charging process. This gas combines with sulfuric acid vapor, which is always present around the battery terminals, to form sulfuric acid. When sulfuric acid reacts with the lead in the battery terminals and the metal parts around them, it results in the formation of a white, green, or bluish powdery substance known as corrosion.

What Does Car Battery Corrosion Look Like?

Car battery corrosion often appears as a crusty, powdery substance on the battery terminals and the surrounding metal components. The color can vary, ranging from white to green or even bluish, depending on the materials involved. It might also appear as a flaky, scaly buildup that can spread and cover the terminal posts and cable connectors, potentially causing electrical issues if left unattended.

Things to Watch Out for When Removing Corrosion

Before attempting to remove car battery corrosion, there are a few key precautions you should keep in mind:

  1. Safety First: Ensure that the car is turned off and that you are wearing protective gear, such as gloves and eye protection, to prevent any contact with the corrosive substances.
  2. Avoid Inhaling Fumes: Corrosion removal can release toxic fumes, so it’s crucial to work in a well-ventilated area or wear a mask if necessary.
  3. Disconnect the Battery: Always disconnect the battery before attempting to clean it to prevent electrical shocks or short circuits.

How to Remove Car Battery Corrosion with Baking Soda and Lukewarm Water

Cleaning car battery corrosion can be done effectively with some simple household items. Here’s a step-by-step guide:

  1. Gather Your Materials: You’ll need baking soda, lukewarm water, a wire brush or old toothbrush, and a wrench or pliers.
  2. Disconnect the Battery: Start by disconnecting the negative (black) terminal first, followed by the positive (red) terminal.
  3. Create a Baking Soda Solution: In a container, mix about 1 to 2 tablespoons of baking soda with enough lukewarm water to create a paste-like consistency.
  4. Apply the Solution: Using the wire brush or an old toothbrush, gently apply the baking soda solution to the corroded areas on the battery terminals and surrounding metal parts. Be cautious not to let the solution seep into the battery itself.
  5. Scrub and Clean: Gently scrub away the corrosion until the terminals and metal parts are clean. If the corrosion is stubborn, you may need to repeat the process.
  6. Rinse and Dry: Once the corrosion is removed, rinse the battery and surrounding area with clean water and thoroughly dry it with a clean cloth.
  7. Reconnect the Battery: Reconnect the positive terminal first and then the negative terminal. Ensure they are tightened securely.


Car battery corrosion is a common issue but can be effectively managed with simple household items like baking soda and lukewarm water. By taking the necessary precautions and following the steps outlined in this article, you can maintain a clean and efficient battery. However, if you are uncertain about cleaning your battery or face difficulties, it’s always a good idea to reach out to professionals like Battery4U. They can provide expert assistance in safely removing and preventing corrosive buildup, ensuring the longevity and performance of your car battery.