10 Best Catalytic Converter Cleaner of December 2025

• Restores Catalytic Converter, Oxygen Sensors, Fuel Injectors and cylinder heads
• EPA Approved
• Easy to use -Simply pop, pour and go every 3 months
• Original long nose bottle which is capless gas tank compatible
• Does not alter fuel composition and is safe for gasoline, diesel and Hybrid engines

Cataclean

• Safe and effective for all petrol (gasoline)and diesel vehicles
• Engineered to clean the entire exhaust system WITH REGULAR USE.
• OXICAT is activated when the catalytic converter reaches its required working temperature.
• Proven safe and effective by the Pros, now available in North America. TUV certified, made in Germany

AUTOPROFI

• Helps eliminate "rotten egg" odor
• May help in passing emissions control test!
• Helps clean oxygen sensor
• Extends time between tune-ups

Solder-It

• Cleans fuel system, injectors, combustion chamber, pistons and valves
• Restores lost horsepower and increases fuel efficiency
• Prevents rotten egg smell
• Reduces toxic gases and CO2 emissions
• Removes carbon deposits

Hi-Gear

• LOWER EMISSION LEVELS: can lower your total hydrocarbon emissions by up to 50 percent. safe for gasoline, diesel, hybrid, and flex-fuel vehicles; does not alter fuel. Not for use in 2-stroke or oil/gas mix engines.
• BETTER ENGINE PERFORMANCE: help clean the fuel injection system, as well as the cylinders, improving overall performance.
• REDUCE FUEL CONSUMPTION & BAD SMELL: while cutting down on fuel consumption, it also gets rid of the icky smell developed by your car overtime.
• PROTECT ENGINE: Proper fuel and exhaust flow will keep that engine running cleaner, smoother, and better, which will also cut down on maintenance costs.
• CLEAN THE ENTIRE SYSTEM: it can also clean other parts like the oxygen sensor, the fuel injectors, cylinder heads, and others. EASY CLEANING: simply pour in your fuel tank.

Keeplus

• 🚗🚗 If you ever notice your fuel economy decrease noticeably or a rotten eggs smell is coming from your engine, then you need to clean the catalytic converter right away!
• 🚗🚗 Deeply clean your converter with Catalytic Converter Cleaner without removing it! Stop the dreaded “service engine” light flashing up on your display, and get better engine performance!
• 🚗🚗This is an absolute money-saver! Thanks to lower maintenance and fuel costs.
• 🚗🚗LOWER EMISSION LEVELS: can lower your total hydrocarbon emissions by up to 50 percent.
• 🚗🚗BETTER ENGINE PERFORMANCE: help clean the fuel injection system, as well as the cylinders, improving overall performance.

FAMOORE

• 🍁 If you ever notice your fuel economy decrease noticeably or a rotten eggs smell is coming from your engine, then you need to clean the catalytic converter right away!Deeply clean your converter with Catalytic Converter Cleaner without removing it! Stop the dreaded “service engine” light flashing up on your display, and get better engine performance!
• 🍁LOWER EMISSION LEVELS: can lower your total hydrocarbon emissions by up to 50 percent.
• 🍁BETTER ENGINE PERFORMANCE: help clean the fuel injection system, as well as the cylinders, improving overall performance.
• 🍁REDUCE FUEL CONSUMPTION & BAD SMELL: while cutting down on fuel consumption, it also gets rid of the icky smell developed by your car overtime.
• 🍁PROTECT ENGINE: Proper fuel and exhaust flow will keep that engine running cleaner, smoother, and better, which will also cut down on maintenance costs.

SOthread(TM)

• Using Cataclean can lower your total hydrocarbon emissions by up to 50 percent
• Reduces carbon build-up in catalytic converter, oxygen sensors, fuel injectors and cylinder heads which results in improved fuel efficiency
• Improves overall vehicle performance-including drivability issues such as power reduction, hesitation, rough idle, hard starts and lost fuel economy
• Safe for gasoline, diesel, hybrid and flex-fuel vehicles; does not alter fuel
• Not for use in 2-stroke or oil/gas mix engines

Cataclean

• ⭕ Safe for gasoline, diesel, hybrid, and flex-fuel vehicles; does not alter fuel. Not for use in 2-stroke or oil/gas mix engines. 💯 Easy cleaning , simply pour in your fuel tank.
• Deeply clean your converter with Catalytic Converter Cleaner without removing it! Stop the dreaded “service engine” light flashing up on your display, and get better engine performance!
• Better engine performance: help clean the fuel injection system, as well as the cylinders, improving overall performance. lower your total hydrocarbon emissions by up to 50 percent.
• Clean the entire system : it can also clean other parts like the oxygen sensor, the fuel injectors, cylinder heads, and others.
• Protect engine : Proper fuel and exhaust flow will keep that engine running cleaner, smoother, and better, which will also cut down on maintenance costs.

Thenxin

• Using Cataclean can lower your total hydrocarbon emissions by up to 50 percent
• Reduces carbon build-up in catalytic converter, oxygen sensors, fuel injectors and cylinder heads which results in improved fuel efficiency
• Improves overall vehicle performance-including driveability issues such as power reduction, hesitation, rough idle, hard starts and lost fuel economy
• Safe for gasoline, diesel, hybrid and flex-fuel vehicles; does not alter fuel
• Not for use in 2-stroke or oil / gas mix engines

Cataclean