10 Best Catalytic Converter Cleaners 2025 in the United States

The Cataclean 16Oz. Fuel/Exhaust Cleaner is designed to help maintain the performance of your vehicle’s catalytic converter and other components like oxygen sensors and fuel injectors. It's particularly appealing for anyone looking for a straightforward solution to keep their engine running efficiently without needing extensive mechanical knowledge. One of its major strengths is its EPA approval, which assures users of its safety and environmental compliance. Additionally, it’s incredibly easy to use; you simply pour it into your gas tank every three months. This convenience is perfect for those who may not be very hands-on with car maintenance.

The product is compatible with various engine types including gasoline, diesel, and hybrids, making it versatile for most car owners. While Cataclean is easy to use, some users might wish for more detailed instructions on its effectiveness for severe issues, as results can vary based on the vehicle's condition. Its effectiveness may not last as long as some users might hope, leading to the need for regular use every three months, which could be seen as a drawback for those looking for a long-term solution.

From an environmental perspective, it doesn’t alter fuel composition, and its capless design makes it compatible with modern gas tanks, which is a plus. However, the frequency of use could be a concern for eco-conscious consumers who prefer products that offer longer-lasting results. The Cataclean cleaner is a solid choice for regular maintenance but may require ongoing commitment to see the best results.

The Cataclean 120007 Complete Engine, Fuel and Exhaust System Cleaner is designed to enhance your vehicle's performance and reduce harmful emissions, making it a great choice for those looking to maintain their car's efficiency. One of its standout features is the ability to lower total hydrocarbon emissions by up to 50%, which is significant for environmentally-conscious drivers. Moreover, it effectively reduces carbon build-up in various components like catalytic converters and oxygen sensors, promoting better fuel efficiency and overall vehicle performance. Users have reported improvements in driveability issues, such as rough idling and hard starts, which makes it beneficial for both everyday drivers and those experiencing specific engine troubles.

In terms of compatibility, Cataclean is safe for use in gasoline, diesel, hybrid, and flex-fuel vehicles, expanding its appeal to a wide range of car owners. However, it is important to note that it should not be used in 2-stroke or oil/gas mix engines, which may limit its usability for some.

Ease of use is another positive aspect, as the cleaner can be simply added to your fuel tank without any complicated procedures. This makes it an accessible option for individuals who may not be mechanically inclined or experienced with automotive products. Cataclean is a strong contender in the catalytic converter cleaner category, especially for those looking to enhance their vehicle’s performance and reduce emissions. Its effectiveness can vary depending on individual vehicle conditions, and it isn't suitable for every engine type.

The Rislone Cat Complete Fuel, Exhaust and Emissions System Cleaner is designed to enhance your vehicle's performance and fuel efficiency while keeping the emissions system clean. One of its notable strengths is its broad compatibility. It works with various types of engines, including gasoline, ethanol, and hybrid vehicles, and is safe for engines with oxygen sensors and catalytic converters. This means you can use it on a range of modern vehicles without worrying about voiding the manufacturer's warranty.

Additionally, its ability to clean the entire emissions and exhaust system, as well as the fuel system, makes it a comprehensive solution for those looking to maintain their car's performance and fuel efficiency. Another key advantage is its environmental compliance. Being EPA registered and 50-state legal, it helps reduce excess exhaust hydrocarbon, carbon monoxide, and nitrogen oxide emissions, which can be particularly useful for passing smog tests.

The product also boasts an ease of use, requiring application every 5,000 miles, which is manageable for most users. The packaging of a single bottle is convenient and simple to use. However, there are some potential drawbacks to consider. Although the product is highly rated with 4 out of 5 stars, some users may find that it doesn't completely eliminate the check engine light issue in all cases. Additionally, while it claims to address sulphur exhaust smell, results can vary depending on the vehicle's condition. The Rislone Cat Complete Cleaner is a versatile and effective option for those looking to maintain their vehicle's emissions and fuel systems, though individual results may vary.