What To Spray In Spark Plug Hole | What you need to know

If you don’t find any spray dedicated to clean the spark plug holes then it is natural to ask what to spray in a spark plug hole?

There are plenty of options like carb cleaners and our beloved WD-40. However, which one does the best job is still a matter of debate. And we are going to settle that debate today.

You will have all your answers, what to spray, how to spay and when to spray. So, stick around and hopefully by the end of this article you will know all about cleaning them spark plug holes.

What To Spray In Spark Plug Hole?

There are a handful of ways you can try and follow in cleaning the spark plug wells or holes. The ones that can be used are shared below-

Carburetor Cleaner

Carburetor cleaners are also known as carb cleaners. You can spray them in the spark plug hole, and they are safe to use. They help dissolve all types of debris and unwanted materials.


You can also use this penetrating oil in the spark plug hole. They prevent moisture by making a protective layer around the hole, and they prevent rust. WD-40 is also a good lubricant, and it can help pull a stuck spark plug from the aluminum head.

If you want to know how to remove stuck spark plug from aluminum head, then you are in luck.

Air Gun

Fix the tip of the air gun in the spark plug hole and send compressed air. This will remove any excess debris, gunks, and loose materials inside the spark plug hole. If you have used WD-40 or carb cleaner, then we recommend that you use the air gun after that to remove any excess dirt and debris.

You can also use an air gun before using carb cleaner or WD-40 to make your job easier. Try to get an air gun with a long tip that will fit the spark plug hole and go deep in.

Brake Cleaner

Brake cleaners are also a safe option. A small amount of it will be enough to dissolve most of the debris and gunk. You can then use a clean cloth to clean any of the oil residue or any other dirt that is there.

So for those who are wondering what to spray in spark plug holes, we hope you have the answer.

Also Read: How To Protect Spark Plug Wires From Headers : Most Effective Solution

How To Clean Spark Plug Hole?

After using any of those items, take a giant screwdriver or any stick-like long object. Now either take a clean cloth or a wired brush and dip it in the spark plug hole. Swing it around properly and thoroughly. This should get all the oil from the hole.

Make sure to repeat that process a few times to eliminate as much oil, debris, and dirt as possible. Moreover, make sure to clean the spark plug itself properly before reinstalling it. You can use sandpaper to clean the spark plug.

Moreover, keeping the plugs and the holes clean will not suffice. You will also have to clean the wires and ensure they work correctly. Keeping the wires clean prevents various problems like arcing. That concludes our answer to how to stop spark plug wires from arcing.

Frequently Asked Questions

Here, we will try to answer some of your most frequently asked questions.

What should I not use in a spark plug hole?

Try to avoid anything that isn’t toxic or for cars. It’s best if you stick to the usable we cited above.

Are Carb cleaners Safe?

Yes. Carb cleaners are safe. They are stronger than WD-40. Furthermore, they will get the job done faster and efficiently.

Can I put oil in the spark plug hole?

It’s best if you can avoid using oil. You can use the oil however, using the oil might lead to more problems than solutions.


Now you know what to spray in the spark plug hole. Spark plugs and spark plug holes shouldn’t be ignored. If you are a car owner, you must keep them clean. However, you won’t need to clean it every day. They require cleaning after running thousands of miles or due to build-up of debris, gunk, and oil.

If you fail to clean them, then your car will face various problems. You will have a bad fuel economy. The car will not respond well, your car won’t start properly, and so on. Eventually, they will lead to bigger problems.

We hope you will be able to clean your spark plug hole properly and easily. Make sure to follow our instructions, and your car will be fine.

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