How to Clean Car Battery Terminals

a red and green battery with a pair of pliers attached to it

Introduction

Car battery terminals can accumulate corrosion over time, causing weak electrical contact, slow starts, or a completely dead vehicle. Cleaning the terminals is a simple maintenance task that improves performance and protects the battery from long-term damage. Here’s how to do it safely and effectively.

What You'll Need

• Baking soda

• Water

• Small brush or old toothbrush

• Protective gloves

• Safety glasses

• Rag or paper towels

• Petroleum jelly

• Wrench (for loosening terminals)

Steps

Turn off the car and disconnect the battery, removing the negative (-) cable first and then the positive (+).
Mix a small amount of baking soda with water to create a cleaning paste or solution.
Apply the mixture to the corroded terminals and allow it to fizz and break down the corrosion.
Scrub the terminals and cable ends with a brush until clean.
Wipe everything dry thoroughly with a rag or paper towels.
Apply a thin layer of petroleum jelly to help prevent future corrosion.
Reconnect the battery, attaching the positive (+) cable first and then the negative (-).

Alternative Methods

• Use a commercial battery terminal cleaner if you prefer a ready-made solution.

• Try using white vinegar to dissolve corrosion before scrubbing.

• Use a battery terminal cleaning tool for faster, more thorough results.

What NOT to Do

• Do not clean terminals while the engine is running.

• Do not let metal tools touch both terminals at once (risk of short circuit).

• Do not ignore heavy or repeated corrosion—it may indicate a failing battery.

FAQs

How often should I clean my battery terminals?

Checking and cleaning them every six months helps prevent corrosion and ensures reliable performance.

Is corrosion dangerous to touch?

Corrosion can be irritating to the skin and eyes, so wear gloves and avoid direct contact.

Can corrosion ruin a battery permanently?

Yes—severe or recurring corrosion may indicate internal battery problems and may require replacing the battery.

This article is for informational purposes only. Always follow manufacturer instructions and use proper safety precautions. You assume all risk for any actions you take based on this guide.

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