How To Clean Battery Terminals

So you’ve come out to your car, cranked the starter, and found that your car is dead? And after popping the hood and inspecting the battery, you’ve found corrosion around the car’s battery terminals and are wondering how you clean them? Well, you’ve come to the right place!

Corrosion occurs around a car battery’s terminals because hydrogen gas leaks from the battery’s sulphuric acid within. When the gas hits the warm ambient air temperatures inside the engine bay, it forms a corrosive environment around the terminals.

Corrosion can interrupt the connection between the battery and the rest of the car, so it’s important to arrest the corrosion as soon as detected. If left untreated, the battery could unexpectedly die, and you’ll end up alongside the road with your thumb out. That’s where The Drive’s crack How To team comes in with its guide for how to clean battery terminals.

Toothbrushes ready? Just kidding.

Estimated Time Needed: 30 minutes to an hour

Skill Level: Beginner

Vehicle System: Electrical

Working on your car can be dangerous and messy, as electricity can jolt you until the paramedics are needed. Here’s what you’ll need to ensure you don’t die, get maimed, or lose a finger and that you keep your jeans, shirt, and skin spotless.

We’re not psychic, nor are we snooping through your toolbox or garage, so here’s exactly what you’ll need to get the job done. 

Organizing your tools and gear so everything is easily reachable will save precious minutes waiting for your handy-dandy child or four-legged helper to bring you the sandpaper or blowtorch. (You won't need a blowtorch for this job. Please don’t have your kid hand you a blowtorch—Ed.)

You’ll also need a flat workspace, such as a garage floor, driveway, or street parking. Check your local laws to make sure you’re not violating any codes when using the street because we aren’t getting your ride out of the clink.

Related Post: Best Car Batteries

The best way to clean your car’s battery terminals is to remove the battery completely. To know how to remove your car’s battery, check out The Drive’s step-by-step guide for How To Change a Car Battery. 

Let’s do this! 

You’re done! Congrats.

The Drive recognizes that while our How-To guides are detailed and easily followed, a rusty bolt, an engine component not in the correct position, or oil leaking everywhere can derail a project. That’s why we’ve partnered with JustAnswer, which connects you to certified mechanics around the globe, to get you through even the toughest jobs. 

So if you have a question or are stuck, click here and talk to a mechanic near you.

Over the years, The Drive’s editors have changed countless batteries. We’ve also seen our fair share of corroded battery terminals. Using our history, and mistakes along the way, here are our go-to pro tips for all the budding mechanics out there.

Whenever you see the build-up of corrosion or calcification, which is rare on more modern cars. 

So long as you have a wire brush, your out-of-pocket expenses are pretty much nil. If you don’t, you’ll likely spend about $10 for a wire brush and baking soda. 

Since you may not have access to the right tools or a friend you can bum a wrench off of, we compiled a list of our best hacks to make your life easier and drain your pocket less.

Odyssey Automotive

ACDelco Professional AGM

Diehard Advanced Gold AGM

Got a question? Got a pro tip? Send us a note: guidesandgear@thedrive.com