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 73434010 Industrial Cleaner & Degreaser is a versatile, concentrated liquid cleaner designed for a wide range of surfaces, including industrial machinery, which can relate to engine parts. Its all-purpose formula is non-toxic, nonabrasive, and solvent-free, making it safe to use on many washable materials without harsh chemicals. It comes with a pleasant lemon scent and is biodegradable, which is a plus for environmentally conscious users.

This product is liquid and concentrated, allowing dilution to match the cleaning strength needed, which is helpful for varying degrees of grime or grease. Since it is marketed as an all-purpose cleaner rather than a heavy-duty engine degreaser, its cleaning strength might not be as strong as specialty degreasers specifically made for tough engine grease and oil. It is compatible with a variety of surfaces, but users should always test on sensitive parts before use.

The application method depends on dilution and manual scrubbing, as no spray or foam functionality is mentioned. This cleaner is a suitable choice for those seeking a safer, environmentally friendly degreaser for light to moderate engine cleaning and other household or industrial uses. However, for heavy, stubborn engine grease, a more specialized product might be necessary.

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.