The Best Engine Degreasers: Top-picks to Buy in 2019

Last Updated: 31 Jan 2019

It’s a settled fact that the flame heart of your car is exposed to a large number of pollutants, which are technical fluids and road dust. These layers could be washed away with running water and ordinary detergent in some circumstances. Unfortunately, the engine's operating temperature often reaches hundreds of degrees, turning these pollutants into a hellish caked mixture, which is very difficult to remove. In addition to the deterioration caused to the appearance of an engine compartment, these layers affect heat transfer of engine and can cause very unpleasant consequences. Therefore, sooner or later, any car owner is faced with the choice of best engine degreaser to remove this scab from the heart of his iron horse.

All manufacturers, without exception, say that their engine cleaner completely removes all the oldest layers of dust and oil stains among others. It is important to inform you that we carried out research in regards of the cleaning properties of different types of best engine degreasers. The results of this research will help you to choose the best one for your car engine.

Best Engine Degreaser FAQ

What Can I Use to Degrease My Engine?

It is possible to find almost any tool designed to clean a particular part of a car. In the same vein, there are many products designed for cleaning the engine. It is in no doubt that most of these materials possess a high level of efficiency and are not difficult to use. Thus, they are suitable for self-cleaning. This allows you to maintain cleanliness without spending extra money on services. The main point in this matter is to choose an engine degreaser correctly. A good engine degreaser not only quickly washes away all the dirt, but also does not harm the details. Put differently, it’s composition should not contain increased aggressiveness.

What Is the Strongest Degreaser?

As you can understand, choosing a good engine degreaser is not a simple task. Some products can be extremely aggressive and may cause engine corrosion as a result. If you don’t take care of the engine before and your car is not a new one, then it is recommended to take Chemical Guys Grime Reaper Extremely Strong Degreaser. This product is, no doubts, the most powerful today. It is very quick and can easily cope with the toughest tasks. At the same time, if you apply it correctly, it won’t cause any problems to plastic around.

How Do You Remove Motor Oil from Engine?

Suffice to say that dust and other contaminants that enter the engine compartment from outside are not the main problems. Most often, the need to wash an engine occurs due to the fact that antifreeze, engine and transmission oil flow out in the process of active operation. This happens under conditions of high heating, such dirt spreads intensively over the surfaces. As a result, the thermal model of an engine can be broken and overheating occurs. It is quite obvious that it will be difficult to clean such contaminants with plain water, soap solutions or car shampoos. It is thus reasonable to use a special best engine degreaser for the external surface of the engine.

TOP 9 Best Engine Degreasers Compared and Reviewed

1. Simple Green 19128 Crystal

1. Simple Green 19128 Crystal

Simple Green Crystal is one product from the Simple Green range that is not green in color. It is instead crystal clear in both appearance and odor. This is why it’s a preferred choice for cleaning most engines.

There is no worry of any contaminants like color dyes or fragrances remaining after degreasing the engine. Besides, Simple Green Crystal is non-toxic, non-hazardous, biodegradable, non-corrosive, non-flammable and generally safe for your engine.

It is also a critical cleaning, highly concentrated application formula, which means it can be diluted before use. Mixing it with some water in a spray bottle also lets you stretch a bottle to use for a longer time.

This offsets the otherwise slightly higher price for the product where you can save money in the long run. Of course, the degreaser is also safe to use for other kitchen cleaning and degreasing needs.

  • Non-flammable, non-corrosive, non-toxic, non-hazardous and biodegradable
  • Safe all-purpose degreaser and cleaner for engines
  • Crystal clear without any dyes or fragrances
  • A concentrated formula which can be diluted before use
  • Safe to use at home too, including on food preparation areas
  • Cleans bike chains too
  • Complaints of receiving bottle without label or directions for use

2. Meguiar's D10801 Super Degreaser

2. Meguiar's D10801 Super Degreaser

If you are looking for something with exceptional degreasing actions, then this degreaser from Meguiar’s is worth trying out. Coming from a reputed manufacturer like Meguiar’s it’s not much of a surprise!

The degreaser is specially formulated to break down even the toughest grease stains that you can clean off with a spray of clean water. It’s so strong, it acts fast even on the toughest grease jobs.

The super degreaser offers the advantage of not leaving any unsightly white residues after degreasing. This means you are left with a sparkling clean engine once you are done.

However, it does instead leave a pleasant, soothing herbal fragrance. Of course, it is mild so some may like it, some may not, and some may not even realize it.

  • A strong formulation that acts quickly even on tough jobs
  • Residue-free performance prevents white residue stains
  • Leaves a pleasant herbal fragrance
  • Easy to use
  • Can be used on upholstery and boat seats when diluted

3. Oil Eater Original Degreaser

3. Oil Eater Original Degreaser

Don’t get fooled by names, like this one. The Oil Eater may sound harsh as a name, but the product sure isn’t! It is a safe formula degreaser without any acids, abrasives or petroleum solvents.

It is also water-based and biodegradable, which is why it is rendered safe for not only your engine but even on non-food surfaces. Oil Eater is a non-toxic, non-hazardous, non-corrosive and USDA approved degreaser for non-food surfaces.

But it is an effective and concentrated degreaser that has to be diluted properly for maximum product performance and value. It is safe for various industrial uses besides engines like in floor scrubbers, machinery, parts washing, pressure washers, lubes, garages, production facilities, and HVAC.

It is also useful around the house like for cleaning carpets, grills, decks driveways, boat hulls, and white wall tires. Just follow its dilution chart to make the perfect light, medium, and heavy-duty cleaner as required. This, in turn, makes its price tag worth it because it goes a long way when diluted.

  • Concentrated but safe, non-hazardous, non-corrosive and non-toxic degreaser
  • Useful for degreasing engines and even various household
  • Have various industrial users
  • Add water to create a light, medium or heavy duty cleaner
  • USDA approved
  • Keep away from children because it’s an eye irritant
  • Avoid contact with skin, eyes and mucous membranes

4. Krud Kutter KK012 Original Concentrated Stain Cleaner

4. Krud Kutter KK012 Original Concentrated Stain Cleaner

Now, this is a product that lives up to its name. Yes, unlike the earlier degreaser, Krud Kutter concentrated KK012 can actually Kutt through the Krud! In fact, there isn’t any other single product that can remove tough stains so quickly and effectively from various surfaces.

This is a special product in this list of degreasers. The Krud Kutter not only cuts through grease but is also effective at removing other stubborn substances like glue, adhesives, crayon, paint overspray, pet stains, wax, tree sap, and tape residue.

To top it all, this is a mild and safe blend of biodegradable, non-flammable, non-toxic and non-abrasive surfactants, emulsifiers and detergents. It is also biodegradable and comes in a water-based solution.

Krud Kutter is also NSF certified and does not contain any bleach, fragrances, ammonia or petroleum solvents.

  • Quickly and effectively removes really tough stains from various surfaces
  • Removes many other substances besides grease
  • A safe and proprietary blend of detergents, emulsifiers, and surfactants
  • Water-based and biodegradable solution
  • Does not contain ammonia, bleach, solvents or fragrances
  • Complaints of it not removing stains

5. Purple Power (4320P) Industrial Strength Degreaser

5. Purple Power (4320P) Industrial Strength Degreaser

The Purple Power Industrial Strength Degreaser is just what you need to not only get rid of grease oil and dirt but it also in the process creates a barrier in between the stain and surface.

Purple Power is a biodegradable, non-flammable, non-abrasive and phosphate-free degreaser ideal for the toughest cleaning jobs. This is why this degreaser is not as mild as other degreasers.

This is another degreaser that’s not only useful for cleaning your engine but also cleans other surfaces at home, the farm, shop and even in marine. It not only cleans cars but is also safe to use on ATVs, motorcycles, snowmobiles, motorcycles and marine-personal craft. To make things better, it’s also really cheap, making it affordable for most people.

  • Concentrated formula quickly penetrates tough stains in seconds
  • Creates a boundary separating the stain and surface
  • Safe to use on various vehicles, and surfaces
  • Biodegradable, non-flammable and non-abrasive
  • Not safe to use on exterior car surfaces, wheel rims, glass or painted surfaces
  • Not safe to mix with household chemicals
  • Complaints that it’s not better than household soap

6. Chemical Guys Orange CLD_201_16 Signature Degreaser

6. Chemical Guys Orange CLD_201_16 Signature Degreaser

Now here’s a signature degreaser meant solely for automobile use. It is Chemical Guys Orange degreaser, which is true to its name, is orange in color. It does its degreasing with the help of powerful citrus extracts and hyper surfactants.

The degreaser is formulated to loosen and emulsify spilled grease, oil, dirt, grime and even spilled motor oil, hydraulic fluid, blinker fluid, coolant or even diesel fuel.

It’s safe to use for removing any mud and road grime from wheels and suspension and undercarriage parts. It helps restore a brilliant shine to chrome and titanium tips by breaking down carbon and black deposits in exhaust systems and machinery.

Chemical Guys is a super concentrated formula, making it worth the money. It can be diluted for lighter cleaning jobs like making your tools look sparkling new or used with full strength to tackle oil tough stains on the floor. Even adding a few drops to a bucket of water makes a perfect mopping solution for your shop floor.

  • Concentrated formula removes toughest stains
  • Orange, citrus-based formula
  • Safe to use on engines, tools, tires, rims, and undercarriages
  • Can be diluted as needed
  • Not safe or useful for cleaning glass
  • Not much better than a household cleaner

7. SuperClean Multi-Surface Degreaser

7. SuperClean Multi-Surface Degreaser

As the name suggests, SuperClean gives your engine a super cleaning. It is an industrial strength cleaner that effectively and quickly removes even the toughest tasks.

SuperClean is biodegradable and phosphate free, and one of the toughest water based degreasers in the market today. It easily removes oil, wax, dirt, tar, and grime on not only engines but also appliances, carpets, BBQ grills, tools, wheels, floor mats, lawn mowers, boats, fishing rods, and RVs.

SuperClean is available as a concentrated and powerful cleanser-degreaser. It is used at full strength for the toughest tasks and can be diluted to as much as 16:1 for other cleaning tasks.

  • Quickly and effectively removes all types of stains
  • Industrial strength degreaser
  • Strong, biodegradable and phosphate free water-based degreaser
  • A concentrated solution that can be diluted for everyday messes
  • An unscented multi-functional degreaser
  • Leaves a haze, but it’s not permanent
  • Complaints of not cleaning better than other detergents
  • Not safe to use on enamel paint

8. Simple Green Pro HD Heavy Duty Cleaner

8. Simple Green Pro HD Heavy Duty Cleaner

The Simple Green Pro is a multi-functional cleaner that can be safely used to clean various surfaces. The list includes painted surfaces, aluminum, polished and stainless steel, chrome and plastic.

This is a non-corrosive, unscented and professional grade product which is safe to use on floors, appliances, walls, industrial equipment and even in commercial kitchens and baths.

Simple Green Pro is also safe for use on metal surfaces to quickly eliminate tough grease and grime and remove stains. As it is biodegradable, there is no worry about it harming plants and lawns.

  • Multi-functional cleaner and degreaser
  • Non-corrosive and professional grade degreaser
  • Can be used on various applications and surfaces
  • Safe for use on metal surfaces and especially carpets when diluted
  • Doesn’t get rid of disgusting smells
  • Complaints about doing poor cleaning jobs

9. Chemical Guys CLD_104 Grime Degreaser

9. Chemical Guys CLD_104 Grime Degreaser

Last on the list is another product from Chemical Guys, the Grime Reaper Degreaser. This is a concentrated degreaser, which implies you can dilute it as required, and thus use the cleaner for a long time to come.

The Grime Reaper is a water-based degreaser designed for tough jobs, and removing oil, dirt, grease and accumulated filth. It not only degreases engines but also tires, wheel wells, undercarriage, and door jambs.

You can actually dilute a part of it with 6-9 parts of water to clean even stubborn and tough stains. The degreaser does its work without leaving any white residue stains.

  • Concentrated degreaser thanks to its super concentration technology
  • A gallon easily makes 10 gallons of cleanser for all types of cleaning jobs
  • Water-based and environmentally friendly degreaser
  • Doesn’t leave any white residue stains behind
  • Can be used in various cleaning applications
  • Keeps machinery and equipment clean and working well
  • Complaints of it working just like soapy water
  • Smells like Windex

Types Of Best Engine Degreasers

It turns out that best engine degreasers differ not only by the form of application. Some of these products are based on water, and others on petroleum. There is also a class of foaming liquids. Let’s see what are they and which one is the most suitable.


Degreasers of this type are safe in use and can be applied on various surfaces without damaging them. Even if you overspray it somehow, the formula is not that aggressive. It is an undeniable fact that water-based cleaners are very effective.


Petroleum-based gunk engine cleaner is cheap and heavy-duty. Its formula doesn’t contain very expensive ingredients. At the same time, there is one huge drawback – you won’t be able to use it on any other surfaces except engine, because of their abrasiveness. Usually, manufacturers put special markings about that on a package.


Foam-based degreaser is usually quick-drying and removes the oppressive dirt from an engine easily. However, they are more expensive and differ greatly in the formula of ingredients used.

Best Engine Degreasers Buying Guide – What To Look At?

The selection of the best degreaser should be made based on several factors.

#1 Type of Cleaner

Cleaners exist in 3 forms: sprays, tribes and foam compounds. It is preferable to buy spray cleaners, as they are easy to use. As for efficiency, they are also among the best. However, in this case, the type of packaging is not critical as aerosol engine cleaners could not be found.

#2 Additional Functions

It is noteworthy that in addition to good cleaning abilities, detergents should also be safe for rubber and plastic parts that abound on engine components. Thus, when washing, these elements should not be destroyed. In addition, it is desirable that a car engine degreaser prevents the destruction of electrical wiring in the engine compartment by aggressive elements, and also limits the possibility of a fire. Aggressive elements are fuel, solvents, salts, which can get into the engine compartment from the bottom or top.

#3 Efficiency

An external engine cleaner, by definition, should well dissolve the spots of grease, oils (lubricants, engine oil), fuels, wash dried dirt, among others. The foam spreading over the treated surface gets into hard-to-reach places, which cannot be approached with the help of rags and this is a great advantage of such cleaners. The further removal of the dirt can be performed using high-pressure water. As for the effectiveness of composition, the information about it can be read in instructions printed directly on the packaging. It would also be useful to get acquainted with reviews of cleaners.

#4 Budget and Volume

Volume should be chosen taking into account the number of planned surface treatments of engine parts. For one-time processing, a small bottle is enough. If you plan to use this tool on a regular basis, it is better to take a bigger galloon. So you will save money.

#5 Safety

The best engine cleaner should be safe, not only for rubber and plastic but also other parts of the car, as well as for human health, skin and respiratory system. In addition, it is desirable that it was safe from an environmental point of view.

#6 Ease of Use

The easiest way is to use aerosol cleaners. Thus, using sprays or tribes, there is no need to contact those with your hands, since application takes place away from contamination. As for foam cleaners, it is often necessary to wash hands after using them.

Best Engine Degreaser – Final Advice

Now you understand how important it is to wash a vehicle’s engine on time. While cleaning with the best engine degreaser, you need to make sure that it provides the results you need. Based on our research and test results, Simple Green Crystal Industrial Cleaner/Degreaser is absolutely the best engine degreaser 2019. It is crystal clear and doesn’t have any artificial scent. It is highly-concentrated and removes stubborn grease, dirt, and stains quickly and effectively. It’s non-abrasive and non-flammable formula is environmentally friendly and can be used also for household surfaces. It will interest you to know that this engine cleaner is FDA-approved and doesn’t cause corrosion. If you are still not sure which to choose, it is recommended to start with this one. A trial of this product will definitely do the talking.
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