10 Best Engine Cleaner of December 2025

• No scrubbing
• Safe on all engine components
• It safely removes grease, dirt, and grime from most engines
• This item is not for sale in Catalina Island

Gunk

• Powerful grease remover and grime fighter in a biodegradable bio-solvent formula with durable, shatter-resistance trigger and convenient refill port; no funnel needed and no-mess
• Safe to use on multiple surfaces. Unlike other degreasers, this formula will prevent glass from etching and aluminum, copper, and metal from corroding and flash rust
• Non-flammable, non-corrosive, non-abrasive, low-odor formula that can be used in food-processing facilities
• Biodegradable formula meets U.S. EPA Safer Choice Standards and is 50-state VOC compliant. NSF Registered A1, A2, A4, A8, B1
• Excellent for cleaning greasy automotive parts, tools, shop floors, industrial machinery, commercial appliances, and equipment

WD-40

• Comes in 15 oz. Aerosol spray can with pleasant citrus scent
• Can be used to eliminate greasy dirt in the home, shop and garage
• Emulsifies and washes away dirt, grease and grime that collect on Modern engines
• Safe on most under-hood rubber, plastic and paint
• It contains no silicones (which are known for creating greasy, dust collecting buildup), is non-flammable, Non-corrosive to metals and has low VOC
• 2-in-one engine cleaner and detailer
• Makes Future Clean Up EasierMakes Future Clean Up EasierMakes Future Clean Up Easier
• Leaves a Satin-like finish
• Pleasant citrus scent

Gunk

• EXPERIENCE AN OBVIOUS DIFFERENCE – Whether you are noticing a delay in acceleration, less than average gas mileage or own a higher mileage vehicle, our Max Thrust engine air filters will provide a clear & cost effective upgrade over stock performance – or your money back.
• TRAP 2X THE DIRT VS. STANDARD AIR FILTERS – Our unique HeX-D pleat design creates maximum holding capacity for trapping unwanted dirt & debris without compromising airflow like standard air filters – thanks to multiple layers of progressively finer filter media that allows air to flow freely even when the filter is dirty.
• INCREASED POWER & MILEAGE UP TO 15K MILES – Deficient airflow can cause your engine to work twice as hard to suck in the minimum amount of air it needs to perform regularly, resulting in poorer gas mileage and lower power efficiency. Max Thrust air filters are designed to give your engine a break by delivering as much clean air as it needs to perform optimally – up to 15K miles.
• DIY W/GUARANTEED FITMENT – Replacement for MDX 3.5L 6-Cylinder GAS (2016-20), MDX 3.0L 6-Cylinder GAS & HYBRID (2017-20), Passport (2019-20), Pilot (2016-20), Odyssey (2018-20), Ridgeline (2017-20). Please make sure to enter the year, make and model of your vehicle using Amazon’s ‘My Garage’ tool to verify fitment – the engine air filter is an easy DIY solution that can save you $$$ at the repair shop.
• BETTER FILTERS THAN YOUR LAST OR YOUR MONEY BACK – We know it’s hard to choose from so many different brands carrying the same product. We make it easier for our customers to decide with a simple promise.

Spearhead

• Cut through grease, grime, oil
• Scrubby texture
• Heavy duty formula
• Clean and restore under-the-hood parts, plastics, vinyl, and metal
• Convenient, disposable wipe in a citrus scent

STP

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.

Chevron

• Auto & Truck Maintenance
• Country of manufacture: United States
• Manufacturer: GUNK

Gunk

• Auto & Truck Maintenance
• Country of manufacture: United States
• Manufacturer: GUNK

Gunk

• Professional strength citrus-based formula
• Removes tough grease, grime, dirt and debris
• Works great on engines, machinery, tools, tires, rims and undercarriages
• Works fast to loosen and emulsify grease, oil, dirt and grime for easy rinse
• Super concentrated - can be diluted to desired needs

Chemical Guys

• Easy way to clean and flush the oil systems of gasoline and diesel engines
• Gentle and rapid cleaning
• Neutral to seals and other materials installed in the engine
• Compatible with catalytic converters
• Simple to use

Liqui Moly