Best Catalytic Converter Cleaner Reviews – Top 3 Products

In case your car failed the emission test due to the catalytic converter, you need the best catalytic converter cleaner. If the term “cat cleaner” is unknown to you, this post will give you an idea of what it is and how it can help you pass the emission test. Catalytic cleaner converter is a specially made solution to clean your car’s converter. All you need to do is to add it ​to your fuel system and use it until the tank is empty.

The product helps clean the converter. But it will not fix your catalytic converter if you have a serious problem. You may still need to replace it. The cleaner will help to reduce emissions and help your engine function at its best. It also increases the MPG. The cleaning solution will not be able to help if the reason for failing the emission test is due to the rich fuel air or other issues.


What is a Catalytic Converter Cleaner?

catalytic converter


As the fuel burns, the car engine produces pollutants that can harm the environment. A ​catalytic converter cleaner is used to make sure that your car emits clean gases that are safe for the air. This is ​done via a chemical reaction between the exhaust gases and the metals inside the converter.

If you notice that your car is not running properly and is consuming more fuel than before, then there is a problem. The unburned fuel will cause damage to the catalytic converter. It also produces a rotten egg smell. This is the main objective of the catalytic converter cleaner - to clean the components that get in contact with it.

The Advantages of Using a Best Catalytic Converter Cleaner

Best Catalytic Converter Cleaner 2


1. Improves Engine Performance

The catalytic converter cleaner will improve the way your car engine burns fuel. It has solvents and acetone that makes sure combustion is complete. The addition of oxygen molecules helps improve the engine performance. This will keep your car performing at its best.

2. Reduced Carbon Built Up

Clogged-up injectors and cylinders ​caused by carbon build-up are a common problem no matter what type of fuel your car uses. This greatly affects your car's engine performance. A high-grade cleaner can prevent carbon deposits and improve fuel combustion.

3. Reduces Harmful Emissions

If your car has ​failed ​the emission tests due to your catalytic converter, then you need something that will help clean it. You need the best catalytic cleaner ​to keep emissions within the ​required levels. During combustion, ​cars release aldehydes, active peroxy compounds, and carboxylic acids. Thus, instead of your car releasing harmful carbon and nitrogen based oxide, it will help produce less toxic gasses. With continued use, the engine will produce amazing results.

Top 3 Best Catalytic Converter Cleaner

**Below, you'll see more detailed reviews, but you can also click the links above to see current prices and read customer's reviews on Amazon.

Red Line (60103) 15 Ounce Fuel System Cleaner


Mr. Gasket catalytic converter cleaner is an exhaust system and fuel cleaner that gets rid of carbon build-up and cleans your car’s catalytic converter, fuel injectors, ​cylinder heads and oxygen sensors. This product does not affect fuel composition and is not harmful to gasoline, hybrid and diesel engines.

It lowers the total hydrocarbon emissions by 50%. The Cataclean fixes drivability concerns like power reduction, hard starts and hesitation, as a pre-treatment before undergoing emission test. It will also help extend the life of your car engine. The product can help to prevent the replacement of expensive oxygen sensors or your car’s catalytic converter. In case you need to replace your converter, use the Cataclean during installation to extend its shelf life.

The product is easy to use; simply pour it into your fuel tank. The Mr.Gasket Cataclean is legal in the USA and complies with VOC and OTC regulations. It also complies with the Federal Low Sulphur content requirements for use in non-road engines and diesel motor vehicles. For better performance and protection, use the product four times a year.


  • Reduces carbon build up to improve fuel efficiency
  • Improves car performance
  • Safe for diesel, gasoline, flex-fuel and hybrid vehicles
  • Easy to use
  • Does alter fuel composition
  • Restores catalytic converter, fuel injectors, oxygen sensors, and cylinder heads
  • Allowed in 50 states


  • No known drawbacks

Royal Purple 11722 Max-Clean Fuel System Cleaner


The Red Line S1 is ​a cleaner ​that also prevents moisture build up, debris and carbon deposits. There are lots of catalytic converter cleaners that use different sorts of PEA purity or ingredients and synthetic oil. This product is verified PEA of 30 to 50%, so you are assured that you are getting the best quality cat cleaner.

​With just one treatment, it can clean the converter ​to up to 100% efficiency. With Red Line S1, the need for octane will be reduced by up to two points. The product uses a unique synthetic upper cylinder lubricant. It is also designed to handle both the lowest and highest engine temperatures in the market.

You can use the product continuously. Compared to its competing fuel system cleaners, this product sets itself apart by providing a higher, more profitable treatment for combustion chambers and intake valves. Use one bottle per tank for effective treatment.


  • Powerful but non-abrasive
  • Reduce the need of octane by two points
  • Both a cleaner and prevents moisture build-up, debris and carbon deposits
  • Verified by PEA
  • Can handle both the highest and lowest engine temperature in the market


  • Not recommended for diesel vehicles
  • Cannot stop or restore functionality

Cataclean Engine And Catalytic Converter Cleaner 450ml


The best thing about this fuel cleaner and stabilizer is that you can use it in various ways. Aside from efficiency and power, this is also very effective in preventing rough idling and stalling. The product will help reduce carbon monoxide, hydrocarbon, and nitrogen oxide emissions.

If you are looking for a fuel system cleaner that penetrates deep and clean injectors, definitely this is the best product. By using the Royal Purple 11722, you reduce ​engine knocking and pinging because of deposits.

It is highly compatible with any type of fuel system. To prove its efficiency, several tests have been conducted. The test results prove that the Royal Purple 11722 was able to improve fuel consumption by up to 3.2% and it increases the horsepower by 2.6%.


  • Prevents premature spark plug fouling
  • Stabilizes fuel during off-season and storage
  • Prevents rough idling, stalling, and engine hesitation concerns
  • Reduces hydrocarbon, carbon monoxide and nitrogen oxide emissions
  • Compatible with any type of fuel


  • No known drawback so far

Final Verdict

Does catalytic converter cleaner really work? Based on the reviews and testimonies of previous users, the answer is yes. It is the best way to improve fuel economy and keep the engine working perfectly. But if there is one thing that you need to remember, it would be the reality that not all products are the same.

According to the above 3 best catalytic converter cleaner reviews we see that the Royal Purple Max-Clean is the perfect choice. What do you think?