How To Clean Car Engine With WD40

WD40 is really the one thing we can rely on for all our mechanical needs. From being used as a lubricant to helping with removing rusted bolts, WD40 is always a handy thing to have in your life. 

In addition to this, WD40 also has excellent rust removing and grease removing properties. This makes it an excellent tool for cleaning the engine bay of your car. 

Naturally, some of you might be wondering if it is safe for you to use WD40 to clean the engine bay of your car. And it totally is! WD40 is great for cleaning the engine bay of any car as long as you take care of a few important things. 

Let’s briefly touch on some of the precautions that you will have to take before you start cleaning the engine bay of your car with WD40. There are just two main things that you will need to look out for in this case.

1. Wiring

Make sure that your car battery is disconnected and that the open electrical connections are covered with a piece of cloth or plastic. WD40 may not be conductive by itself, but the dust and grime that it displaces can be bad for a solid electrical connection if not cleaned properly. 

2. Cover the intake and remove loose dust

You will need to cover the air intake of your engine to ensure that no liquid gets inside it. This step may not be so crucial, but it is always better to be safe just in case. 

One more thing that you will need to do is to remove the loose surface dust that is present in your engine bay. This will make it much easier for you to remove the dust that is actually stuck in there, as the surface dust will not be filling up your cleaning cloth or towel.

And with the basics out of the way, let’s get into how exactly we can use WD40 to get a nice and shiny engine bay. 

How To Clean Car Engine With WD40

When cleaning your engine bay with WD40, there are certain tricks that will make the job much easier for you. Let’s take a look at them.

To start off, you should make sure that you run your car engine for 5–10 minutes before you start cleaning. This will bring up the temperature of the engine, which will make it easier for you to remove the grease with your WD40. 

Also, once you have warmed up your engine, do remember to disconnect the battery and cover any exposed wiring with a cloth or plastic bag. 

As for the cleaning itself, just use a piece of cloth to remove the surface dust from your engine bay so that your job with the WD40 is made easier. 

While using the WD40, just spray the area you want to clean and use a microfibre cloth or tissue paper to remove the grease. Use circular motions to remove the grease as that is the most effective method. 

After you are done cleaning the engine, you will need to dry it. Of course, while WD40 dries pretty quick, you can just run the engine for 5–10 minutes after cleaning in order to speed up the process. 

Starting the engine brings up its temperature, which makes it easier for the WD40 to evaporate from the closed-off surfaces. 

If you have some rusty areas in your engine bay, then this will be an excellent time for you to remove that surface rust. Just spray the WD40 on the rusty areas and start cleaning with a metal brush. 

WD40 is great for removing surface rust. It’s better to take care of the rusty bits as well while doing the cleaning so that the end result is flawless. 

Also, keep in mind to use WD40 on parts like the hinges and latches of your engine bay. As a lubricant, WD40 will be great for making sure that these parts work smoothly in your engine bay. 

What not to do while cleaning your Engine with WD40

We have gone through all the things you need to do in order to clean your engine properly with WD40. Let’s also take a look at some of the things you should avoid.

1. Don’t just start spraying all over 

With a dirty engine bay right in front of your eyes, you might be tempted to just spray WD40 all over it and start the cleaning process. But keep in mind that you should remove the loose dust first while the engine surface is still dry. 

2. Disconnect battery and cover wiring

Disconnect the battery before you start cleaning the engine bay. This will not only make the work safer for you, but it will also prevent the chance of a short circuit occurring and damaging the electrical components of your car. 


Is it a good idea to wash your car engine?

Is it allowed to clean the engine of a car? The engine can be washed, so it must be done safely. And even if you make a mistake, you may encounter various problems. For example, when you clean the engine yourself, wires, sensors, and other delicate engine components can be exposed to water.

Is it safe to spray your engine with water?

Spraying the engine compartment with water is absolutely safe in most of today’s vehicles. Weatherproof air boxes and cable connections are now installed in the engine compartment of modern automobiles. Alternators, air filters, or sensors cannot be sprayed with high-pressure water.

Can I clean my car engine with water?

Water gets into the alternator or engine sensor and causes it to fail. Often, dust and debris get on the belt, causing squealing. You will use a water-soluble engine degreaser if you follow the instructions on the container. Discourage the use of solvent-based cleaners, as they will only attract more dust to the engine.

Is it OK to pressure wash a car engine?

Of course, high-pressure cleaning of car engines is healthy, so why are you worried? No matter how much you open the hood to check the fluid level or inspect the engine, you have to accept that it looks pretty clean. Okay, so high-pressure engine flushing is safe.


So that was it about cleaning your engine bay with WD40. It may seem like a weird idea to some at first, but it actually makes a lot of sense. 

WD40 is great at removing grease buildup and also removing surface rust from your engine bay. 

There are just a few precautions you have to take before you start the cleaning process. This just includes disconnecting the battery and covering the wiring of your engine bay. 

You can run the engine of your car for 5–10 minutes to heat it up a little so that it is easier to remove the grease. 

And before you start cleaning the engine, just take some time to remove surface dust with a piece of cloth. Doing this will make the cleaning process easier as there will be less dust to worry about. 

Once you are done with that, just apply WD40 to the areas you want to clean and move your cloth in a circular motion to remove the grease. 

Do remember to use WD40 on things like the latches and hinges to ensure smooth operation. 

And that was all for this article. I hope that the tips provided here were helpful to you. 


Hi, I'm the initiator and writer of this blog. Cars were and will be my first love, and my favorite hobby, that's why I decided to start this blog and write about my discoveries and techniques to improve my cars or repair them.