Best Engine Bay Cleaners for a Clean, Dressed Engine
Updated How we research
Meguiar's D10801 Super Degreaser, 1 Gallon
Meguiar's D10801 Super Degreaser in a 1 Gallon jug, a concentrated degreaser for engines and wheel wells.
Our score8.6/10Mid-range
Gunk EB1 Engine Brite Original Heavy Duty Engine Degreaser, 15 oz
Gunk EB1 Engine Brite Original Heavy Duty Engine Degreaser in 15 oz, a classic aerosol for oily engines.
Our score7.5/10Budget
An engine bay cleaner is a degreaser that cuts through the oily film, dust, and grime that collect on and around your engine. You dilute it, spray it on a cool engine, agitate, and rinse for a fresh, uniform look under the hood. A clean bay makes leaks easier to spot and adds appeal at resale, so it matters to detailers and enthusiasts alike. When choosing one, look for a formula safe on plastics, rubber, and painted surfaces, favor concentrates you can dilute to match how dirty things are, and consider pairing with a dedicated dressing. Always cover sensitive electronics and keep the engine cool before you spray.
The short version
We compared 8 picks. Our scores range from 7.2 to 8.6 out of 10, across $, $$ price bands.
- Best overall:Meguiar's D10801 Super Degreaser, 1 Gallon. Highest overall score in this guide at 8.6/10.
- Also great value:Simple Green Pro HD Heavy Duty Cleaner & Degreaser Concentrate, 1 Gallon. Value score of 9/10, overall 8.0/10.
- Solid build:SONAX Engine Cleaner - Powerful Degreaser, Phosphate & Solvent-Free, 500 ml. Build and materials score of 8/10, overall 8.1/10.
- Feature-rich:WD-40 Specialist Foaming Machine and Engine Degreaser, 18 oz. Features score of 7/10, overall 7.8/10.
Scores are our editorial assessment, not customer ratings. How we score
- 1.Meguiar's D10801 Super Degreaser, 1 Gallon8.6/10$$Check price
- 2.SONAX Engine Cleaner - Powerful Degreaser, Phosphate & Solvent-Free, 500 ml8.1/10$Check price
- 3.Simple Green Pro HD Heavy Duty Cleaner & Degreaser Concentrate, 1 Gallon8.0/10$Check price
- 4.WD-40 Specialist Foaming Machine and Engine Degreaser, 18 oz7.8/10$Check price
- 5.Griot's Garage 10959 Engine Cleaner, 22 oz7.8/10$Check price
- 6.GUNK EBT32 Engine Cleaner and Degreaser, 32 oz7.8/10$Check price
- 7.Gunk EB1 Engine Brite Original Heavy Duty Engine Degreaser, 15 oz7.5/10$Check price
- 8.Purple Power 4319PS Industrial Strength Cleaner and Degreaser, 40 oz (2 Pack)7.2/10$Check price
#1Meguiar's D10801 Super Degreaser in a 1 Gallon jug, a concentrated degreaser for engines and wheel wells.
Fit for the job 9/10 · Features and specs 8/10 · Build and materials 8/10 · Value 9/10
- + 1 Gallon concentrate provides many engine cleanings
- + Dilutable strength adapts to light or heavy grime
- + Meguiar's professional product quality
- - Needs separate spray bottles for application
- - Too strong for delicate plastics if used undiluted
#2SONAX Engine Cleaner, a powerful degreaser in 500 ml that is phosphate and solvent-free for gentler engine bay cleaning.
Fit for the job 9/10 · Features and specs 7/10 · Build and materials 8/10 · Value 8/10
- + Phosphate and solvent-free formula is gentler on rubber
- + Powerful degreasing for oily engine surfaces
- + 500 ml bottle is a good size for home detailers
- - Higher price than bulk degreasers
- - Heavy caked-on grime may need multiple applications
#3Simple Green Pro HD heavy duty cleaner and degreaser concentrate in 1 Gallon for engines and shop use.
Fit for the job 8/10 · Features and specs 8/10 · Build and materials 7/10 · Value 9/10
- + Concentrate can be diluted for engine bays and wheel wells
- + 1 Gallon jug is great value for regular detailing
- + Versatile cleaner for shop floors and tools
- - Requires dilution and a spray bottle
- - Can be too aggressive for some coatings if not diluted
#4WD-40 Specialist Foaming Machine and Engine Degreaser in 18 oz, a clinging foam for greasy engine bays.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 9/10
- + Foaming formula clings to vertical engine surfaces
- + WD-40 brand availability makes it easy to buy
- + 18 oz can handles a full engine bay clean
- - Must avoid spraying on sensitive electronics
- - Strong degreaser can dull some plastics if left too long
#5Griot's Garage 10959 Engine Cleaner in 22 oz, a ready-to-use engine bay cleaner for enthusiasts.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 8/10 · Value 8/10
- + Ready to use formula saves dilution steps
- + 22 oz bottle offers a generous amount for engines
- + Griot's quality works well on plastics and metal
- - Less aggressive than industrial degreasers
- - Pricier than generic engine degreasers
#6GUNK EBT32 Engine Cleaner and Degreaser in 32 oz, a trigger bottle for controlled engine cleaning.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 9/10
- + Trigger bottle gives more control than aerosols
- + 32 oz size handles multiple engine cleanings
- + Low price for a heavy duty degreaser
- - Harsh on rubber and plastics if left too long
- - Requires thorough rinsing to prevent residue
#7Gunk EB1 Engine Brite Original Heavy Duty Engine Degreaser in 15 oz, a classic aerosol for oily engines.
Fit for the job 8/10 · Features and specs 6/10 · Build and materials 7/10 · Value 9/10
- + Heavy duty formula cuts through thick oil and grease
- + Classic Gunk product used by mechanics for decades
- + Very affordable price per can for occasional engine cleaning
- - Strong solvent smell requires good ventilation
- - Aggressive cleaner can harm painted or delicate surfaces
#8Purple Power 4319PS industrial strength cleaner and degreaser, 40 oz in a 2 Pack for tough engine grime.
Fit for the job 7/10 · Features and specs 7/10 · Build and materials 6/10 · Value 9/10
- + Industrial strength formula tackles heavy grease
- + 2 Pack gives plenty of product for several cleanings
- + Budget-friendly option for DIY mechanics
- - Can stain aluminum or painted surfaces if left to dry
- - Strong chemical smell and skin irritation risk
Before you buy: trade-offs we flagged
No pick is perfect. These are the main compromises we noted for the top products in this guide, so you can check they will not matter for you.
- Needs separate spray bottles for application (Meguiar's D10801 Super Degreaser, 1 Gallon)
- Higher price than bulk degreasers (SONAX Engine Cleaner - Powerful Degreaser,...)
- Requires dilution and a spray bottle (Simple Green Pro HD Heavy Duty Cleaner &...)
- Must avoid spraying on sensitive electronics (WD-40 Specialist Foaming Machine and Engine...)
- Less aggressive than industrial degreasers (Griot's Garage 10959 Engine Cleaner, 22 oz)
- Harsh on rubber and plastics if left too long (GUNK EBT32 Engine Cleaner and Degreaser, 32 oz)
Frequently asked questions
›What is the best choice among engine bay cleaners for a clean, dressed engine?
Meguiar's D10801 Super Degreaser, 1 Gallon is our top overall pick. Meguiar's D10801 Super Degreaser in a 1 Gallon jug, a concentrated degreaser for engines and wheel wells. It earns our score of 8.6/10, based on fit for the job, features, build and value.
›What is a good budget option?
Gunk EB1 Engine Brite Original Heavy Duty Engine Degreaser, 15 oz is the strongest low-cost pick in this guide. Gunk EB1 Engine Brite Original Heavy Duty Engine Degreaser in 15 oz, a classic aerosol for oily engines.
›How much should I expect to spend?
Picks in this guide span $ to $$ price bands (roughly: $ = under $30, $$ = $30 to $100, $$$ = over $100). We never display exact prices because they change constantly, so the buttons above always show Amazon's current price.
›How were these products chosen?
We shortlist products that fit the job this guide solves and compare their published specifications, such as size, capacity, materials and what is included. Each pick gets an editorial score out of 10 for fit, features, build and value, and we write the pros and cons from those details. Our score is not an Amazon customer rating. We earn a commission if you buy through our links, which never affects the ranking.
Car Detail Picks independently selects every product; we may earn a commission from links above.
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