10 Best Engine Degreasers for a Clean Engine Bay
A clean engine bay makes it easier to spot leaks, work on your car, and impress a buyer when it’s time to sell. The right degreaser cuts through oil, grease and road grime without a lot of scrubbing.
We rounded up ten of the best-reviewed engine degreasers and engine bay cleaners on Amazon, from budget industrial concentrates to detailer favorites.
Prices and ratings below were accurate at the time of writing and can change.
The Best Engine Degreasers
1. Simple Green Industrial Cleaner and Degreaser
Approx. price at time of writing: $9.98 · Rating: 4.7★ on Amazon (9.7K+ ratings)
Simple Green’s industrial formula is a garage staple that can be diluted for everything from engine bays to shop floors.
Why We Like It: Versatile, affordable and widely trusted.
Best For: All-around garage use.
Pros:
- Can be diluted
- 4.7 stars
- Multi-purpose
Cons:
- May need agitation for heavy buildup
2. Spray Nine Heavy Duty Cleaner & Degreaser
Approx. price at time of writing: $13.48 · Rating: 4.7★ on Amazon (14K+ ratings)
Spray Nine is a heavy-duty cleaner, degreaser and disinfectant with a big review base.
Why We Like It: Strong cleaning power with tons of positive reviews.
Best For: Tough grease and grime.
Pros:
- 14K+ ratings
- Heavy duty
- Multi-use
Cons:
- Test on sensitive surfaces first
3. Oil Eater Original Cleaner Degreaser, 1 Gallon
Approx. price at time of writing: $12.99 · Rating: 4.3★ on Amazon (11K+ ratings)
Oil Eater comes as a concentrate in a gallon jug, so a single purchase goes a long way.
Why We Like It: Excellent value for frequent use.
Best For: Shops and frequent DIYers.
Pros:
- Gallon size
- Concentrate
- Great value
Cons:
- Needs dilution
4. Chemical Guys Signature Series Orange Degreaser
Approx. price at time of writing: $11.99 · Rating: 4.5★ on Amazon (7.8K+ ratings)
Chemical Guys’ citrus-based degreaser is a detailer favorite for engine bays, wheels and tires.
Why We Like It: Citrus formula with a big following among detailers.
Best For: Detailers and enthusiasts.
Pros:
- Citrus based
- Popular
- Versatile
Cons:
- Smaller bottle than gallon options
5. Chemical Guys All Clean+ Citrus All-Purpose Cleaner & Degreaser
Approx. price at time of writing: $23.98 · Rating: 4.6★ on Amazon (5.7K+ ratings)
All Clean+ is a citrus all-purpose cleaner and degreaser that works on engine bays as well as interior and exterior surfaces.
Why We Like It: One bottle that handles many detailing tasks.
Best For: Detailers who want one versatile cleaner.
Pros:
- All-purpose
- 4.6 stars
Cons:
- Less aggressive than dedicated heavy degreasers
6. Krud Kutter Original Cleaner Degreaser, 32 oz
Approx. price at time of writing: $7.97 · Rating: 4.4★ on Amazon (5.5K+ ratings)
Krud Kutter is a well-known cleaner and degreaser sold in an easy-to-use spray bottle.
Why We Like It: Cheap, ready-to-use and effective.
Best For: Quick cleanups.
Pros:
- Ready to use
- Low price
Cons:
- 32 oz runs out quickly on big jobs
7. Purple Power Industrial Strength Cleaner and Degreaser
Approx. price at time of writing: $4.99 · Rating: 4.4★ on Amazon (2.4K+ ratings)
Purple Power is a strong, inexpensive industrial degreaser that’s been a shop favorite for years.
Why We Like It: The lowest-cost pick on our list.
Best For: Heavy grease on a tight budget.
Pros:
- Very cheap
- Industrial strength
Cons:
- Strong formula; rinse well and avoid sensitive finishes
8. WD-40 Specialist Machine & Engine Degreaser Foaming Spray
Approx. price at time of writing: $33.96 · Rating: 4.7★ on Amazon (1.8K+ ratings)
WD-40’s foaming degreaser clings to vertical surfaces, giving it time to break down grease on engine parts.
Why We Like It: Foaming formula stays where you spray it.
Best For: Vertical surfaces and engine parts.
Pros:
- Foaming
- 4.7 stars
- Trusted brand
Cons:
- Higher price
9. 3D Orange Degreaser Citrus-Based Car Cleaner
Approx. price at time of writing: $17.99 · Rating: 4.5★ on Amazon (1.9K+ ratings)
3D’s citrus degreaser is made for automotive use on oil, grease and grime.
Why We Like It: A car-specific citrus formula from a detailing brand.
Best For: Detailers who prefer citrus cleaners.
Pros:
- Automotive focused
- Citrus based
Cons:
- Mid-range price
10. Meguiar’s Professional D108 Super Degreaser, 1 Gallon
Approx. price at time of writing: $29.99 · Rating: 4.7★ on Amazon (1.3K+ ratings)
D108 is part of Meguiar’s professional detailer line and comes in a gallon jug for dilution.
Why We Like It: Pro detailer chemistry with a lot of uses per gallon.
Best For: Serious detailers.
Pros:
- Professional line
- Dilutable gallon
- 4.7 stars
Cons:
- More than casual users need
Buying Guide: Choosing an Engine Degreaser
Work on a cool engine. Spraying a hot engine can cause streaking and is unsafe. Let it cool completely.
Protect sensitive parts. Cover the alternator, air intake, fuse box and exposed electrical connectors with plastic bags.
Rinse gently. Use a low-pressure hose, not a pressure washer aimed at electronics.
Dress plastics afterward. A plastic and rubber protectant restores the finish and helps repel dirt.
Frequently Asked Questions
Is it safe to wash an engine bay?
Generally yes, if the engine is cool, sensitive components are covered and you avoid high pressure on electrical parts.
Citrus or solvent degreaser?
Citrus degreasers are often milder and more pleasant to use, while industrial formulas can cut heavier buildup faster.
How often should I degrease my engine?
Once or twice a year is plenty for most drivers, or before selling a car.