10 Best Engine Degreasers 2025 in the United States

The Chemical Guys Signature Series Orange Degreaser is a heavy-duty, all-purpose cleaner designed to tackle tough grease, oil, and grime on engines, tires, and undercarriages. Its concentrated formula allows adjustment of strength depending on the cleaning job, ranging from light to heavy-duty, adding versatility. It works quickly to break down stubborn contaminants, making it efficient for both automotive and industrial use.

The spray, scrub, and rinse application method is straightforward and suitable for users who prefer an easy cleaning process. It is safe for exterior parts like undercarriages and wheel wells. While the product brief does not specify biodegradability, users concerned with environmental impact may want to investigate further. Trusted by professionals and enthusiasts alike, the degreaser is known for reliability and strong cleaning power.

Since it is a chemical degreaser with professional strength, careful use is recommended to avoid potential damage to sensitive surfaces or skin, even though it is designed for safe exterior use. This degreaser is well-suited for anyone needing a powerful cleaner for automotive or industrial grime, especially those seeking a flexible product capable of handling various levels of dirt and grease.

The Simple Green Industrial Cleaner and Degreaser is a versatile, industrial-strength cleaning solution available in a 1-gallon bottle. This product is recognized for its powerful cleaning ability, capable of handling heavy dirt, grease, food residue, and stains on a wide range of washable surfaces such as counters, carpets, floors, machines, equipment, and vehicles. One of its standout features is its biodegradability, making it an environmentally friendly choice, as recognized by the U.S. EPA's Safer Choice Program. This means it is safer for both users and the environment compared to many conventional degreasers.

The cleaner is also cost-effective due to its concentrated formula, which allows users to dilute it according to their specific cleaning needs, thus extending the product’s usage and value. Additionally, its compatibility with various cleaning equipment, like floor scrubbers and pressure washers, adds to its practical appeal for both manual and professional cleaning tasks. However, the product's strong industrial scent of sassafras might be a drawback for those sensitive to strong odors.

Moreover, while its broad application is a plus, it may require careful handling and proper dilution to avoid potential damage to delicate surfaces. Its weight of 7.72 pounds and larger dimensions might also make it less convenient to handle for some users. This Simple Green cleaner is a robust and environmentally friendly option for heavy-duty cleaning tasks, ideal for users who need a versatile and effective degreaser for various surfaces but can manage its strong scent and the need for proper dilution.

The SONAX Engine Cleaner is a strong liquid degreaser designed to tackle tough engine grime, oil, and grease effectively. Its powerful cleaning ability makes it suitable for restoring engines and parts to a like-new condition without much scrubbing, thanks to its excellent penetration into hard-to-reach areas. One of its key advantages is its gentle formulation—it’s safe to use on metal, plastic, and rubber components, so it won't cause stains or damage sensitive engine parts like brake or air conditioning lines. This makes it a good choice for both professional detailers and car enthusiasts who want a thorough but careful clean.

The product is also phosphate- and solvent-free, meaning it avoids harsh chemicals and is more eco-friendly and safer for regular use compared to many conventional degreasers. The fresh scent is an added bonus for those sensitive to strong chemical odors. However, the product is a liquid that requires proper application, and for best results, following up with a protective trim detailer is recommended to maintain the shine and condition of rubber and plastic surfaces.

Due to its strong cleaning power, safety features, and eco-conscious formula, this cleaner qualifies as an excellent option for anyone looking to deep clean their engine without risking damage or using harmful chemicals. While it is effective for engine and machine cleaning, the relatively high weight and large packaging might be less convenient for casual users needing smaller quantities.