Auto Engine Detailing
Don't panic; it's easier than you think!

Auto engine detailing is an area of car detailing and car care that is filled with much more bad information than good!

Anyone looking under the hood of their car will become instantly fearful with the thought of water coming in contact with the car engine and its many moving parts, electrical connectors, and fuses.

automotive engine detailing

The combination of bad information from misinformed people, along with a natural level of concern leaves no doubt as to why so many people are unwilling, or very fearful of trying to clean a car engine. The reality is that while a little common sense should be applied to every area of life, the good news is that learning how to detail a car engine is much easier than most could ever imagine!

A Clean Engine is a Happy Engine

It is unlikely I would have to explain why you would want to clean your engine; otherwise you would not be here. But there are other reasons a person may find themselves "needing" to detail or clean their engine aside from just "wanting" a clean engine.

One day you may find your mechanic insisting you get your engine cleaned or degreased so he can figure out where a leak is coming from, or for a variety of other repairs.

Let me tell you all the many reasons I recommend cleaning and detailing your car engine:

  • I love the look of a perfectly clean and detailed engine.
  • Unless you are a plant or worm; dirt is an enemy to everything! Including your car engine and the endless components of your engine.
  • When your engine is clean, it presents the ability to see the beginning of a problem sooner, rather than later. (oil leaks, water leaks, worn belts, etc.)
  • I believe that when you take your car in for service; any mechanic will not only prefer to work on a clean engine, but will actually treat your car better. A clean engine will provide for a happier mechanic (we want a happier mechanic) and will strongly suggest to your mechanic that you are a more discerning and particular customer. There will be a greater expectation put upon him to perform to a higher standard on your car than the typical dirty-ass car engine)

auto engine detailing

"I have heard that you should never get your engine wet, or that there are certain parts of your engine that have to be covered if you are going to clean the engine of your car."

Yes, a hundred years ago that statement would have been much more relevant and true. But today's engines are not the engines of yesterday.

If you lift the hood to where your engine is hiding out and examine the way it is built, you will begin to see how most modern day engines have much in the way of covers and shrouding.

You should also examine all the electrical connectors and observe how protected they are. Not only are all the electrical connectors built with heavier duty connectors, but are typically assembled using a grease like substance that protects the actual contact points from moisture and water.(this cannot be seen unless you disconnect the connectors)

This is all good news!

Auto Engine Detailing:
Is it really safe?

The simple answer is YES!

By this point you are likely beginning to come to a new understanding of modern day engines and your ability to actually clean and detail a car engine...

specifically, YOUR car engine!!

"But Darren, what about the fuse box or alternator; surely these cannot become wet?"

Yes and no.

Allow me to explain.....

  • A big majority of cars have the fuses located inside your car.
  • If the fuse box is located in the engine bay, it is fully housed in a fuse box that is built to be very secure and protected from dirt, moisture, and water. (unless it is severely damaged, you would have to try very hard to get water into this box)
  • Cars today have fuel-injection systems which are completely contained systems that are air and water tight. (there are very few exceptions to this rule. On a few of the Ford truck engines, the seals around the fuel injectors have the ability to leak water through. This is the only exception I have come across in the 30 years I have been auto engine detailing. If you are still concerned, you can ask your mechanic.)
  • With the steps I recommend below, I show you how to go about auto engine detailing in the safest of ways.

Clean Engine or Dirty Engine:
Which one would you rather have

BMW auto engine detailing beforeBMW engine before engine detailing
BMW auto engine detailing afterBMW engine after engine detailing

Auto Engine Detailing:
The actual steps to a clean engine

  • To be performed on cool to warm engine. Cleaning and detailing a very hot car engine is not advisable. If you cannot rest your hand on the top of the engine (the intake manifold specifically) for approximately 30 seconds, I would consider this a hot engine.
  • Spray entire engine with degreaser.
  • Use any brushes necessary to break-up areas of excessive dirt/grease/oil build-up.
  • Hose off using tap water from your garden hose with either a water nozzle attached for directional pressure, or an electric pressure washer.
  • Use leaf blower (or compressed air if you have access to an air compressor) to blow engine so no standing water exists within engine bay. Paying special attention to what you might consider sensitive areas.
  • Wipe down any standing water present on car paint, glass, etc. to prevent water-spotting. (You may want to do this prior to blowing the engine off with the leaf blower)
  • Start engine and allow engine to heat up to normal operating temperature. (approximately 10 minutes) to allow any moving parts or belts to dry completely. (occasionally you will hear a squeal from the fan belts upon initial start-up. As a rule this will stop within the first few seconds. If it continues for the duration of the first two minutes, you might need to use some belt lubricant that can be purchased from your local auto parts store. This has happened one time in my 30 year career.)
  • Apply some form of dressing to engine if you want a truly detailed and shiny engine. (this is not a requirement, but simply for visual enhancement of your car engine.)
  • Stand back in amazement at your amazing results.

Engine Degreasers that Work!

A quality engine degreaser like the ones below will produce amazing results. Both products are concentrates and can be custom diluted based on your needs.

ZEP Industrial Purple Cleaner & Degreaser Concentrate, 1 Gallon (128 Fl. Oz.)

  • Amazingly strong and versatile cleaner and degreaser.
  • Concentrate allows you to custom blend based on your needs.
  • Mix according to label instructions.
  • Use your custom dilution to saturate entire engine that is either cool or warm.
  • Remember to look above to see if the underside of hood needs cleaning.
  • Also an excellent cleaner/degreaser for countless jobs on your car or around the house.

Darren's Tips: I realize that for many of you, purchasing an entire gallon of degreaser to perform your auto engine detailing to clean a single car engine would seem like overkill, so let me bullet point it out as I think it is worthy of knowing the benefits:

  • You will likely want to detail your engine in the future which is always going to require you to clean your car engine first anyways. (more detailing means more product)
  • This degreaser is seriously amazing at removing light to heavy duty grease build-up.
  • Since it is a concentrate, you can also use it for endless other jobs around the house.
  • You will be surprised at how much product you can end up using for auto engine detailing.
  • If you do buy this gallon size, I recommend some of the dispensers below.
  • Can also be used specifically to clean your tire sidewalls from all the dressing and dirt build up when washing your car.

KRUD KUTTER KK32 Original Concentrated Cleaner/Degreaser, 32-Ounce

  • An excellent degreaser in a smaller, more convenient, single use only size. (I say single use as most of you will go through an entire bottle of this stuff just detailing your car engine once)
  • As simple as simple gets. (No mixing; just use straight from the sprayer)
  • Very effective and highly rated degreaser.
  • Can also be used specifically to degrease your tires when washing your car to remove tire dressing build-up.

Darren's Tip: I have a large audience and everyone comes here with different needs and wants. Many of you are looking to detail your auto engine for the very first time. Many of you also don't want to over-commit to a large amount of a product just so you can have a clean and detailed car engine. For this reason, this ready to use degreaser will likely represent the winning value for you and your world.

Tools for Professional Results

Smith 190285 1-Gallon Bleach and Chemical Sprayer for Lawns and Gardens or Cleaning Decks, Siding, and Concrete

  • Saves your grip from exhaustion over using a traditional pump sprayer.
  • Can be filled with any of your chemicals where much spraying is needed.
  • Simply fill the container with your degreaser, add appropriate amount of water to create your desired dilution ratio, pump to compress air, and simply point and shoot.
  • A much quicker and easier way to completely cover your engine with degreaser.

Darren's Tip: If you have ever had to spray large amounts of liquids from a traditional sprayer, you will love this pump sprayer! Just add your favorite degreaser or cleaner to this sprayer, pump to pressurize, and you can cover your entire engine with degreaser in under a minute rather than a few minutes of traditional pump sprayer and a rather tired hand when done.


28mm Gray Chemical Resistant Spray Head 9-1/4" Dip Tube (6-pack)

  • These are the exact sprayers I use professionally.
  • You will need to choose what kind of spray bottles you want to use.
  • You can get unmarked (generic) sprayers, or search within Amazon for some dedicated spray bottles with logos from various detail companies if that is your thing: Meguiar's, Chemical Guys, etc.
  • I recommend getting this 6 pack as you will always need additional sprayers, and it is far more economical to buy them in bulk.

Chemical Resistant Bottles and Sprayers - 32 ounce (3-pack)

  • A complete set of 3 for anyone who wants to keep it simple.
  • Generic spray bottles with same spray heads I use professionally.

Going From Good To Great!

Use the brushes below to take your auto engine detailing to a higher level of results and professionalism.

I am offering two choices based on you and your needs. Either choice promise to deliver professional results.

Tire/Wheel Brush Kit

  • If you keep up on your auto engine detailing and overall cleaning, you may never need the additional help these brushes can offer.
  • For the rest of us; you will likely need to agitate the heavily soiled areas with one of these brushes once you have saturated your engine with your choice in an engine degreaser from above.
  • This is the exact brush kit I use professionally for engine detailing, wheel cleaning, wheel wells, undercarriage, or the underside of your hood.
  • Durable nylon bristles that are also feather at the tips for an extra level of effectiveness and safety.

Mothers Wheel Brush

  • An excellent brush capable of many uses. (auto engine detailing is only one of many uses)
  • Feather tips for effectiveness and safety.
  • A number one seller based on reviews.
  • Softer brushes than the green ones above. (this can be both the good news and the bad news based on the amount of dirt and grease build-up you are dealing with when auto engine detailing.

Engine Dressing

Dressing your engine as part of the auto engine detailing is a requirement for me and my world. You may come to a different conclusion based on your preference.

Darren's Note: Many people get "wiggy" about applying a dressing to their car engine. I have always been a huge fan; but it's not for everyone. Many people will also become wiggy once they read some of the labels of traditional dressings due to the flammable warning labels; especially the aerosol dressings. Just read the descriptions below and decide which one you are most comfortable with.

  • Really makes your engine "POP" after you have done the initial cleaning.
  • Doesn't necessarily "attract" dirt/dust, but will allow dirt/dust to stick to your engine better.
  • Rather than only look at this as a problem, you might also consider a dressing as a sacrificial layer. A superficial layer that now prevents dirt from actually touching your engine and components, but can easily be cleaned off each time, It is a matter of perspective and experience.
  • I know many off-roaders that accept that dirt will "stick" to a freshly dressed engine, but understand that it is easily cleaned away with the accumulated dirt when they perform the auto engine detailing each time.
  • You apply dressing after you have blown the engine off to remove excess water before starting engine. I use an electric leaf blower as can be seen in the videos below.

CarPro PERL Coat Plastic & Rubber Protectant 500 ml

  • One of the few dressings that are actually labeled for use on engine's.
  • If you choose this one, I recommend diluting it down with tap water 1;1. (this means half dressing, and half water)
  • A thinner consistency works better on car engines than the thicker consistency.

Stoner Car Care More Shine Tire Dressing - 18 oz, 91084

  • I prefer an aerosol dressing over the traditional dressings as they are so easy to apply.
  • The light consistency allows for complete penetration of the endless details of auto engine detailing.
  • Any aerosol will be flammable due to the propellant. So any aerosol dressing will also be labeled as flammable.
  • I never use on a running or hot engine. Cool to warm engine's only.
  • The actual dressing is not flammable so once you have sprayed the engine, you will not have to worry. (I know there are many of you that will, so I suggest you stick with the CarPro PERL above)
  • I have used aerosol dressings ever since I first started detailing engines well over twenty years ago and have never had a single problem.
  • There are many aerosol dressings you can choose from and I demonstrate many different types within the many auto engine detailing videos I have done. They all perform similarly enough where you don't need to overthink it. Since I go through so much, I buy a separate brand by the case which cannot be found within amazon.
  • If you live in an area where you depend on air freight for shipment, you will not be able to order any of the aerosols.
  • Simply spray entire engine with a light application once you have finished blowing engine off, allowed engine to run until it reaches normal operating temperatures, and allowed to cool back down. I promise; you will be amazed!

Auto Engine Detailing Video's

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