5 Best Engine Degreaser for Pressure Washer: Options Compared

Cleaning your engine with a pressure washer can be a game-changer, but you need the right degreaser to cut through tough grime without damaging components. The wrong product can leave residue or harm metal surfaces, so choosing wisely is key.

This guide reviews five top engine degreasers designed for pressure washer use, from heavy-duty concentrates to versatile sprays. We’ll help you pick the best option for your specific cleaning tasks, whether it’s a car engine, industrial equipment, or outdoor surfaces.

Simple Green Pro HD Heavy Duty Cleaner Concentrate – Professional Grade

Simple Green Pro HD is a professional-grade concentrate that works well with pressure washers for heavy-duty degreasing. Its non-corrosive formula is safe on metal surfaces, making it ideal for cleaning engines, industrial equipment, and even commercial kitchens. You can use it in pressure washing, parts washing, or ultrasonic cleaning, and it quickly eliminates tough grease and grime without damaging the underlying metal.

This product is a PROP 65 listed item, which is important to note for safety compliance. It’s designed for multi-purpose contractor applications, so it’s versatile enough for automotive, RV, and general cleaning tasks. The concentrate allows you to adjust the strength based on the job, giving you control over cleaning power while being effective on stains and buildup.

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• Simple Green Pro HD is a PROP 65 product, non-corrosive, professional grade product
• Developed for multi-purpose contractor applications including use on floors, walls, industrial equipment, appliances; automotive or recreational vehicle cleaning and degreasing
• Also including commercial kitchens and baths and for pressure washing, parts washing, ultrasonic cleaning and more
• It quickly eliminates tough grease and grime, removes stains, and is safe on metal surfaces
• Simple Green Pro HD is your one-stop cleaner and degreaser

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Chemical Guys Signature Series Orange Degreaser Spray – Heavy Duty Cleaner

Chemical Guys Signature Series Orange Degreaser is a professional-strength spray that breaks down grease, oil, and grime on contact. It’s designed for engines, tires, undercarriages, and tools, making it a versatile choice for automotive detailing. The concentrated formula can be diluted for lighter cleaning tasks, giving you flexibility in how you use it with a pressure washer or sprayer.

This degreaser is safe for use on multiple surfaces, including engine bays, wheels, and garage equipment. Its easy spray application allows you to target tough spots directly, and the heavy-duty cleaning power restores surfaces without excessive scrubbing. For pressure washer use, you can apply it, let it dwell, and rinse off for a thorough clean that removes road grime and buildup effectively.

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• Powerful Degreaser (CLD_201_16SW) – Signature Series Orange engine cleaner and degreaser spray quickly breaks down grease, oil, grime, and dirt on engines, tires, undercarriages, tools, and more for a deep professional clean
• Heavy Duty Cleaning – Professional-strength engine degreaser spray formula dissolves tough grease and road grime on contact; restores surfaces with ease for use on cars, trucks, SUVs, motorcycles, RVs, and more
• Versatile Multi-Surface Use – This Chemical Guys degreaser is safe to use as a engine bay cleaner, and for wheels, tires, undercarriages, garage tools, and shop equipment; delivers effective cleaning power wherever tough grease and oil buildup occurs
• Easy Spray Application – Concentrated engine degreaser automotive formula can be diluted for light cleaning or used full strength for heavy-duty jobs; spray, scrub, and rinse for fast and effective degreasing results
• Professional Detailing Strength – Developed for detailers and enthusiasts who need maximum performance; this car engine cleaner is trusted by shops worldwide for tackling the dirtiest jobs with speed and reliability
• Fresh Citrus Degreaser Formula – Infused with a signature orange scent that makes tough cleaning more enjoyable; this heavy duty degreaser cleaner leaves behind a fresh, clean finish after degreasing engines, wheels, and tools
• Restores surfaces – Bring back the clean look of parts & tools with this heavy duty degreaser that is great as engine cleaner spray

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Krud Kutter Multi-Purpose Pressure Washer Concentrate – Deep Clean

Krud Kutter Multi-Purpose Pressure Washer Concentrate is a commercial-strength formula that penetrates and removes tough dirt, oil, grease, and stains. It’s compatible with a wide range of surfaces, including wood, vinyl, concrete, brick, and stone, making it great for outdoor cleaning tasks. You can apply it with a pressure washer, let it sit for 3–5 minutes, and rinse clean without scrubbing.

This concentrate offers efficient coverage, with one gallon making up to 20 gallons of solution and cleaning up to 5,800 square feet. It’s ideal for large residential or commercial jobs like cleaning siding, decks, walkways, and pool areas. The no-scrubbing requirement saves time and effort, while the advanced formula handles bird droppings, tree sap, and grease effectively for a deep clean.

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• COMMERCIAL STRENGTH ADVANCED FORMULA: Penetrates and removes tough dirt, oil, grease, bird droppings, tree sap, and more
• WIDE SURFACE COMPATIBILITY: Ideal for wood, vinyl, and aluminum siding; roofing shingles, gutters, stucco, brick, masonry, concrete, decks, walkways, pool areas, patio furniture, RVs, boats, engines, equipment, and more
• NO SCRUBBING REQUIRED: Apply with a pressure washer, allow product to remain on the surface for 3–5 minutes to penetrate, then rinse clean
• EFFICIENT COVERAGE & DILUTION: One gallon makes up to 20 gallons of solution and cleans up to 5,800 square feet for large residential or commercial jobs
• BLEACH FREE FORMULA: Fast-acting, biodegrabable formula for easy cleaning around the home and building exteriors

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B52 The Ultimate Degreaser – Heavy Duty Industrial Strength

B52 The Ultimate Degreaser is a heavy-duty industrial strength concentrate that dissolves oil and grease on contact. Its inorganic formula is safe on paint and metal surfaces, so you can use it on engines, equipment, trucks, and other surfaces without worrying about damage or corrosion. This makes it a strong choice for pressure washing tough buildup in automotive or industrial settings.

This degreaser is solvent-free and biodegradable, making it safer for outdoor and household use compared to harsh chemical alternatives. The concentrated formula provides powerful cleaning power, and you can dilute it as needed for different jobs. It’s designed to cut through stubborn contamination instantly, helping you restore surfaces quickly and effectively with a pressure washer.

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• Ultimate Degreasing Power: Professional-grade heavy-duty degreaser designed to tackle the toughest grease and oil buildup on engines, equipment, trucks, and surfaces
• Safe on Paint and Metal Surfaces: Formulated to be safe for use on paint and all metal surfaces without causing damage or corrosion during cleaning
• Heavy-Duty Inorganic Formula: Dissolves grease and oil instantly on contact with its powerful inorganic composition that cuts through stubborn contamination
• Solvent-Free and Biodegradable: Contains no harsh solvents and is biodegradable, making it safe for industrial, automotive, outdoor, and household use
• Ultra-Concentrated Formula: Can be used full strength or diluted up to 15:1 for lighter cleaning tasks, providing versatility and cost-effectiveness
• Military-Grade Performance: Originally developed for commercial and fleet operations with military-grade specifications for demanding cleaning applications
• Multiple Size Options Available: Offered in convenient sizes including 32 oz, 1 gallon, 5 gallons, and 55 gallons to meet various project needs

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QWORK Air Blow Gun Pneumatic Engine Cleaning Gun – Sprayer Tool

QWORK Air Blow Gun is a pneumatic cleaning tool that uses high-speed syphon spray action to blast away dirt, grease, and oil from engine bays and machinery. It features a long angled nozzle that reaches narrow, awkward spaces inside engines, decks, and wheel areas, making it easier to clean where brushes can’t reach. The 4-foot siphon hose feeds from your own container of degreaser, allowing you to use any cleaner you prefer.

This tool has a pressure trigger and ergonomic grip for improved efficiency and control during use. It’s designed to combine with your degreaser for a powerful cleaning experience, especially in tight engine compartments. While it’s not a degreaser itself, it’s a valuable accessory for applying degreasers with a pressure washer or air compressor, helping you achieve thorough cleaning results.

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• ENGINE CLEANING GUN FOR TOUGH GRIME: Pneumatic cleaning gun uses a high-speed syphon spray action to help blast away dirt, grease, and oil from engine bays and machinery; combines air blow gun control with solvent sprayer reach for faster detailing.
• LONG NOZZLE FOR TIGHT AREAS: Extended angled nozzle reaches narrow, awkward spaces inside engines, mechanical interiors, decks, and wheel areas; helps direct spray where brushes can’t reach for more targeted cleaning.
• 4FT SIPHON HOSE FEEDS FROM YOUR CONTAINER: Includes a 4ft oil siphon hose (1/4" diameter) so you can dip into oils, solvents, cleaners, or degreaser and keep your sprayer tool moving around the vehicle without dragging a bottle.
• PRESSURE TRIGGER, ERGONOMIC GRIP: Pressure trigger design improves efficiency and lets you modulate spray/air output; ergonomic handle helps reduce hand fatigue during longer engine cleaning and shop tasks.
• INSTALL & USE TIPS + IN THE BOX: Package includes pneumatic engine cleaning gun and 4ft hose; install hose securely before use and test spray with a small amount of cleaner—keep the nozzle aimed away from face/painted surfaces when blasting residue.

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Buyer’s Guide: What to Consider

When choosing an engine degreaser for your pressure washer, consider these key factors to ensure effective and safe cleaning.

• Concentrate vs. Ready-to-Use: Concentrates offer cost savings and adjustable strength, while ready-to-use sprays are convenient for small jobs. Choose based on your cleaning frequency.
• Surface Safety: Ensure the degreaser is safe for metal, paint, and other surfaces you'll clean. Non-corrosive formulas protect engine components and finishes.
• Biodegradability: Biodegradable degreasers are better for the environment and safer for outdoor use. Check labels for solvent-free options if eco-friendliness is a priority.
• Dwell Time: Some degreasers require a few minutes to penetrate grime before rinsing. Products with short dwell times save time during pressure washing.
• Coverage Area: For large jobs, consider concentrates that cover many square feet per gallon. This reduces the need for frequent refills and improves efficiency.

Conclusion

Choosing the best engine degreaser for your pressure washer depends on your specific needs, whether it’s professional-grade cleaning, automotive detailing, or large outdoor jobs. The Simple Green Pro HD offers versatility, while the Chemical Guys Orange Degreaser excels in automotive use. For industrial tasks, the B52 Ultimate Degreaser is a strong choice.

For targeted cleaning, the QWORK Air Blow Gun is a handy tool to pair with any degreaser. Consider your surfaces, coverage needs, and eco-preferences to make the right pick. All these options deliver reliable performance for pressure washer degreasing.