Cars use catalytic converters to trap harmful gases and toxic chemicals from entering the ecosystem and convert them into gases released by the exhaust that are far less harmful for the environment. Using the best catalytic converter cleaners will help you recover your lost power and make for a cleaner environment.

When your catalytic converter starts to collect these harmful particles it blocks the passage of gases making your car work not as efficiently. Using the best catalytic converter can help solve this problem before replacing the expensive catalytic converter.

Read till the end to find out the best catalytic converter cleaners.

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Best Catalytic Converter Cleaners: 2021 Editorial Choice

Best Overall

DURA LUBE Severe Catalytic and Exhaust Treatment

DURA LUBE Severe Catalytic and Exhaust Treatment

Best Value

Cataclean 120007 Complete Engine

Cataclean 120007
Complete Engine

Honorable Mention

Redline Complete SI-1

Redline Complete
SI-1

DURA LUBE Severe Catalytic and Exhaust Treatment

Best Overall

Pros

  • Affordable
  • Helps Restore Lost Power
  • Cleans The Oxygen Sensors
  • Universal Purpose: Works On All Cars

Cons

  • Not For Diesel Engines

DURA LUBE comes first on our list as it does generally what most people want to get from a catalytic converter. It is the best solution of chemical reaction to clean the catalytic converter, pass emissions and make the car run a little better for a little buck. The DURA LUBE is formulated to protect and treat the Catalytic Converter and Exhaust System from oil poisons. The  chemical solution is mixed to your fuel tank and can help clean both your catalytic converter as well as the oxygen sensors. You can use this product as a pre-treatment before entering an emissions test or getting a check engine light that points to a bad catalytic converter. 

Remember: Cars nowadays use electronics and once the sensor detects a little bit of block in the passage of the catalytic converter it will throw an error, it might work  on 95% efficiency but the 5% is drawing you back and giving error codes. It is a good idea to use the best catalytic converter cleaners before you try replacing expensive cats.

Cataclean 120007 Complete Engine

Best Value

Pros

  • Easy To Use
  • All-Purpose, Cleans The Fuel System, Engine, Exhaust
  • Improves Idling And Cleans The Sensors
  • For All Fuels

Cons

  • Not For Use In 2-Stroke Or Oil-Gas Mix Engines

Cataclean 120007 Complete Engine is one of the best catalytic converter cleaners in return for money because it can also help clean the whole fuel system as well as the internal engine parts, including piston heads, valves and exhaust.

Cataclean claims to lower the total hydrocarbon emissions by up to 50%, clean the entire fuel system all in for once and help the overall performance of the car. That is done thanks to the formula of the cataclean that enters from the fuel system to the fuel injectors, inside the combustion chamber and out to the exhaust. All the chains will be cleaned by using this product, furthermore, Cataclean can also clean your O2 sensors and carbon deposits, which will make for a car that runs more efficiently, 

The Cataclean however is not for use in 2-stroke or oil-gas mix engines, but  it is safe for any type of fuel, gasoline, diesel, hybrid and flex-fuel vehicles; it does not alter fuel.
Redline Complete SI-1

Honorable Mention

Pros

  • General Cleaner,Cleans The Fuel System, Engine, Exhaust
  • Improves Idling And Cleans The Sensors
  • For All Fuels

Cons

  • Nozzle to short for some cars
  • More Than A Bottle Needed

Redline Complete SI-1 is a concentrated fuel system cleaner that claims to achieve 100% cleaning of your vehicle internal combustion together with the catalytic converter. It is in our list of the best catalytic converter cleaners because it does really do a good job cleaning and making car run a little better but with a downside.


This product has a synthetic lubricant formula, which coats the upper cylinders, and if used regularly as part of your maintenance kit it prevents carbon deposits on the throttle body and intake. It will also clean injectors, works well with carburetors as well,cleans the valves and last but not least the cats. The only downside of using this product is that you will need more than one. 

Final Thoughts

If you are looking for something that makes your car run rougher and you quite can’t figure it out, using Cataclean 120007 Complete Engine or Redline Complete SI-1 will be a good solution for you. It will clean all the possible deposits, dirts in the oxygen sensors clean the fuel system and internal engine components. If you are looking at something that is specifically made for cleaning the catalytic converter DURA LUBE is our choice for the best catalytic converter cleaners that you can buy.

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