Best Exhaust System Cleaners: Keep Your Car Running Smoothly

What are the best exhaust system cleaners? We give you a list of the best exhaust system cleaners to help you pick the right one and keep your car running smoothly.

Keeping your exhaust system clean is key to a smooth-running car. A good cleaner can boost performance and save you money on repairs.

Clogged exhausts cause poor fuel economy and failed emissions tests. Cleaners remove carbon buildup and restore power.

With so many options, finding the right cleaner can be tricky. This guide will help you choose the best one for your needs.

List of Top 10 Exhaust System Cleaners

Title	Best For	Price
Cataclean Fuel & Exhaust System Cleaner for Gasoline Engines, 16 oz, 2 Pack	Cataclean Fuel & Exhaust System Cleaner is perfect for car owners who want to save money and keep their vehicle running smoothly. It’s ideal for anyone looking to pass emissions tests, improve fuel efficiency, and avoid costly repairs.	View on Amazon (paid link)
Cataclean Fuel & Exhaust System Cleaner for Gasoline Engines, 16 oz	Cataclean is perfect for drivers who want to save money and keep their car running smoothly. It’s ideal for anyone facing emissions tests or check engine lights.	View on Amazon (paid link)
Rislone 4720 Cat Complete Fuel, Exhaust, Emissions System Cleaner, 1-Pack	This product is perfect for car owners who want to boost performance, save on gas, and avoid costly repairs. It’s ideal for all engine types and safe for newer vehicles.	View on Amazon (paid link)
STP Exhaust & Emissions System Cleaner, 15 fl oz, Fuel System Cleaner and Gas Treatment to Support Emissions Performance	This product is perfect for car owners who want to keep their engines clean and running smoothly. It’s great for anyone facing exhaust smoke or rough idling and needs a quick, easy fix.	View on Amazon (paid link)
Dura Lube Severe Catalytic and Exhaust Treatment Cleaner Fuel Additive, 16 fl. oz., (PN: HL-402409 PDQ3)	This product is perfect for anyone who wants to keep their car running smoothly. It’s great for drivers looking to save money and protect their engine.	View on Amazon (paid link)
Cataclean (120007-2PK) Fuel and Exhaust System Cleaner – 16 fl. oz., (Pack of 2)	Cataclean is perfect for anyone who wants to keep their car running smoothly and reduce emissions. It’s great for gasoline, diesel, hybrid, and flex-fuel vehicles.	View on Amazon (paid link)
Ciirvoe 3Pcs Catalytic Converter Cleaner Kit,Boost Up Catalytic Convertor Cleaner,Exhaust System Pipe Carbon Removal Cleaner Treatment Additive Oil,Fuel System Treatment Oil Additive	This Ciirvoe catalytic converter cleaner kit is perfect for drivers who want a no-tool, easy way to clear carbon buildup from their catalytic converter, fuel injectors, and exhaust system without any mechanical skill. It works for owners of gasoline, diesel, hybrid, and flex-fuel vehicles who want smoother rides, better engine response, and lower repair costs.	View on Amazon (paid link)
Rislone 4784 Crystal Clean Diesel DEF & SCR Emission System Cleaner, 1-Pack	This product is perfect for diesel vehicle owners who drive in stop-and-go traffic or make frequent short trips. It’s ideal for preventing crystallization buildup in the SCR system, keeping your vehicle clean and efficient.	View on Amazon (paid link)
Rislone 4784-6PK Crystal Clean Diesel DEF & SCR Emission Cleaner, 6-Pack	This product is perfect for diesel vehicle owners who regularly drive at slow speeds, make frequent stops, or take lots of short trips that cause crystallization buildup in SCR systems. It is also ideal for any diesel driver who wants to keep their emissions system clean without voiding their new vehicle warranty.	View on Amazon (paid link)
Mothers Exhaust Tip Cleaner & Polish, 8 oz. (05138)	This exhaust tip cleaner is perfect for car owners who want to restore shine and protect their vehicle’s exhaust tips. It’s great for both tough cleaning jobs and regular maintenance.	View on Amazon (paid link)

Detailed Reviews

We found the best exhaust system cleaners for you. Our top picks offer strong cleaning, simple use, and great value. Read on to see which product will keep your car clean and efficient.

1. Cataclean Fuel & Exhaust System Cleaner for Gasoline Engines, 16 oz, 2 Pack

Cataclean is a powerful fuel and exhaust system cleaner for gasoline engines. It helps your car pass emissions tests with confidence. Just add it to your fuel tank for an easy clean.

It boosts fuel economy and restores engine performance. Your check engine light may turn off after using it.

Regular use keeps your catalytic converter running efficiently. It’s safe for most engines and legal everywhere.

Pros	Cons
Pass emissions tests with confidence. Improve fuel economy and performance. Clear check engine lights easily. Protect catalytic converter efficiency. Easy application, no tools needed.	Not a permanent fix for major engine issues. Results may vary by vehicle age and condition. Requires repeated use for long-term benefits.

Perfect For:

Cataclean Fuel & Exhaust System Cleaner is perfect for car owners who want to save money and keep their vehicle running smoothly. It’s ideal for anyone looking to pass emissions tests, improve fuel efficiency, and avoid costly repairs.

Ready to Purchase?

View Price on Amazon (paid link)

2. Cataclean Fuel & Exhaust System Cleaner for Gasoline Engines, 16 oz

Cataclean Fuel & Exhaust System Cleaner is a powerful solution for gasoline engines. It cleans vital parts like catalytic converters and fuel injectors.

This product reduces emissions by up to 50%, helping you pass emissions tests. It also improves fuel economy, restores engine power, and clears check engine lights.

Regular use prevents carbon build-up, maintains catalytic converter efficiency, and prolongs its lifespan. Easy to use, just add to your fuel tank, no special skills needed.

Pros	Cons
Pass emissions tests with confidence using Cataclean. Boost fuel economy and engine performance effortlessly. Clear check engine lights and save on repairs. Extend catalytic converter life with regular use. Easy application, no tools or skills needed.	Not instant fix: Takes time to see results. Regular use needed: Must use often for best effects. Costly maintenance: Adds up if used frequently.

Perfect For:

Cataclean is perfect for drivers who want to save money and keep their car running smoothly. It’s ideal for anyone facing emissions tests or check engine lights.

Ready to Purchase?

View Price on Amazon (paid link)

3. Rislone 4720 Cat Complete Fuel, Exhaust, Emissions System Cleaner, 1-Pack

Rislone 4720 Cat Complete cleans your fuel, exhaust, and emissions systems. It boosts power, performance, and mileage. Works with gasoline, ethanol, and hybrid vehicles.

Regular use every 5,000 miles keeps systems clean and efficient. It prevents costly repairs and stops the CEL light from coming back.

Safe for oxygen sensors and catalytic converters. Works on all engine types, from fuel-injected to turbo. Trusted for over 75 years.

Pros	Cons
Boosts power, performance, and mileage. Saves on costly repairs. Won’t void your warranty. Works with all engine types. Trusted brand for 75+ years.	Not for diesel, limits use in some vehicles. Regular use needed, adds to maintenance routine. Results take time, no instant fixes.

Perfect For:

This product is perfect for car owners who want to boost performance, save on gas, and avoid costly repairs. It’s ideal for all engine types and safe for newer vehicles.

Ready to Purchase?

View Price on Amazon (paid link)

4. STP Exhaust & Emissions System Cleaner, 15 fl oz, Fuel System Cleaner and Gas Treatment to Support Emissions Performance

STP Exhaust & Emissions System Cleaner cleans your fuel system. One 15 fl oz bottle removes injector deposits.

It reduces exhaust smoke for cleaner running. Your engine performs better daily.

Supports emissions readiness before testing. Restores power and response quickly. Easy pour-in treatment saves time.

Pros	Cons
Cleans your fuel system for better engine performance. Reduces exhaust smoke for a cleaner drive. Supports emissions readiness for consistent test results. Restores power and smooth driving experience. Easy pour-in treatment, no tools needed.	Effects only last one full tank of gas Doesn’t fix major existing engine damage May not work on very old engines

Perfect For:

This product is perfect for car owners who want to keep their engines clean and running smoothly. It’s great for anyone facing exhaust smoke or rough idling and needs a quick, easy fix.

Ready to Purchase?

View Price on Amazon (paid link)

5. Dura Lube Severe Catalytic and Exhaust Treatment Cleaner Fuel Additive, 16 fl. oz., (PN: HL-402409 PDQ3)

Boost your engine’s performance with Dura Lube Severe Catalytic and Exhaust Treatment Cleaner. This 16 fl. oz. fuel additive works on all engines to keep your vehicle running smoothly.

Use it before replacing your catalytic converter to save money. It protects your catalytic system, reduces harmful buildup, and improves fuel economy.

Pros	Cons
Boosts engine performance and saves fuel Works on all engine types Protects your catalytic system Reduces harmful catalyst buildup Cuts costly converter replacement	No instant results – Takes time to show performance improvements. Regular use needed – Must apply often for best protection. Not a fix-all – Doesn’t replace damaged parts, only prevents issues.

Perfect For:

This product is perfect for anyone who wants to keep their car running smoothly. It’s great for drivers looking to save money and protect their engine.

Ready to Purchase?

View Price on Amazon (paid link)

6. Cataclean (120007-2PK) Fuel and Exhaust System Cleaner – 16 fl. oz., (Pack of 2)

Cataclean is a powerful cleaner for your car’s fuel and exhaust system. It comes in a pack of two 16 fl. oz. bottles. This product is safe for most vehicles.

It reduces harmful emissions by up to 50 percent. Cataclean also improves fuel efficiency and vehicle performance.

Cataclean is easy to use and works with gasoline, diesel, hybrid, and flex-fuel vehicles. It does not alter fuel and is not for 2-stroke engines. Keep your car running smoothly with Cataclean.

Pros	Cons
Cuts emissions by 50%, cleans your engine. Boosts fuel efficiency, saves you money. Fixes rough idles, smooths your drive. Safe for all vehicles, easy to use.	Not for 2-stroke or oil/gas mix engines Won’t fix broken catalytic converters May need repeat use for heavy buildup

Perfect For:

Cataclean is perfect for anyone who wants to keep their car running smoothly and reduce emissions. It’s great for gasoline, diesel, hybrid, and flex-fuel vehicles.

Ready to Purchase?

View Price on Amazon (paid link)

7. Ciirvoe 3Pcs Catalytic Converter Cleaner Kit,Boost Up Catalytic Convertor Cleaner,Exhaust System Pipe Carbon Removal Cleaner Treatment Additive Oil,Fuel System Treatment Oil Additive

Ciirvoe 3Pcs Catalytic Converter Cleaner Kit,Boost Up Catalytic Convertor Cleaner,Exhaust System Pipe Carbon Removal Cleaner Treatment Additive Oil,Fuel System Treatment Oil Additive

The Ciirvoe 3Pcs Catalytic Converter Cleaner Kit keeps your engine and exhaust system clean. It reduces carbon buildup in key parts like the catalytic converter and fuel injectors. This helps your car run smoother and perform better.

It’s easy to use—just pour one bottle into your fuel tank. Works with gasoline, diesel, hybrid, and flex-fuel vehicles. No tools or special skills needed, making it hassle-free.

Regular use helps maintain your vehicle’s value and reduces future repairs. A practical addition to your car care routine for long-term performance.

Pros	Cons
Cleans catalytic converter, boosts engine performance. Easy pour-in use, no tools needed. Safe for most vehicles, worry-free storage. Maintains vehicle value, reduces future repairs.	Not for 2-stroke or oil-mix engines May need multiple uses to work Does not fix severe engine damage

Perfect For:

This Ciirvoe catalytic converter cleaner kit is perfect for drivers who want a no-tool, easy way to clear carbon buildup from their catalytic converter, fuel injectors, and exhaust system without any mechanical skill. It works for owners of gasoline, diesel, hybrid, and flex-fuel vehicles who want smoother rides, better engine response, and lower repair costs.

Ready to Purchase?

View Price on Amazon (paid link)

8. Rislone 4784 Crystal Clean Diesel DEF & SCR Emission System Cleaner, 1-Pack

The Rislone 4784 Crystal Clean Diesel DEF & SCR Emission System Cleaner keeps your diesel vehicle running smoothly. It prevents crystallization build-up in the SCR system. Use it every 5,000 miles for best results.

This cleaner is safe for all diesel emission systems. It works with AdBlue, DEF, and more. It won’t void your warranty.

Pour it into the blue-capped DEF tank only. Do not add it to the diesel fuel tank. Keep your system clean and problem-free with regular use.

Pros	Cons
Crystal Clean prevents harmful SCR system crystallization buildup completely Safe for all diesel vehicles and emission systems Easy to use – simply add to your DEF tank Maintains your vehicle’s warranty while cleaning Works with all AdBlue and DEF systems	Only for DEF tank – Not for fuel tank, easy to mix up. Must use often – Apply every 5,000 miles to keep it working. Specific use only – Won’t clean other diesel parts.

Perfect For:

This product is perfect for diesel vehicle owners who drive in stop-and-go traffic or make frequent short trips. It’s ideal for preventing crystallization buildup in the SCR system, keeping your vehicle clean and efficient.

Ready to Purchase?

View Price on Amazon (paid link)

9. Rislone 4784-6PK Crystal Clean Diesel DEF & SCR Emission Cleaner, 6-Pack

Rislone 4784-6PK Crystal Clean Diesel DEF & SCR Emission Cleaner keeps your diesel vehicle’s SCR system free from crystallization build-up. It’s perfect for vehicles driven at slow speeds or making frequent stops. Use it every 5,000 miles to prevent issues.

This cleaner is safe for all diesel systems, including DOC converters and DEF tanks. It won’t void your warranty and works with AdBlue, Cummins, and more.

Just add it to your DEF tank (blue cap) to keep your system clean and efficient. Do not put it in the diesel fuel tank.

Pros	Cons
Prevents crystallization build-up in SCR systems for smoother performance. Safe for all DEF systems, won’t void your warranty. Works with all diesel brands, universal compatibility. Easy to use, just add to DEF tank every 5,000 miles.	Only for DEF tank, not diesel fuel—easy to mix up. Must use every 5,000 miles—forget, and issues return. No instant fix—takes time to clean.

Perfect For:

This product is perfect for diesel vehicle owners who regularly drive at slow speeds, make frequent stops, or take lots of short trips that cause crystallization buildup in SCR systems. It is also ideal for any diesel driver who wants to keep their emissions system clean without voiding their new vehicle warranty.

Ready to Purchase?

View Price on Amazon (paid link)

10. Mothers Exhaust Tip Cleaner & Polish, 8 oz. (05138)

Mothers Exhaust Tip Cleaner & Polish removes baked-on carbon and heavy buildup fast. It cleans, polishes, and protects in one easy step. Your exhaust tips come out shiny and new.

Advanced micro-polishing agents make metal surfaces bright and smooth. The formula is safe on stainless steel, chrome, and black chrome.

This cleaner is strong on neglected tips but gentle for regular use. It restores luster and leaves a long-lasting shine.

Pros	Cons
Removes stubborn buildup, restoring original shine. Cleans, polishes, and protects in one step. Safe for all exhaust finishes, including black chrome. Gentle for regular use, powerful for neglected tips.	Not for all metals: Avoid aluminum and titanium exhaust tips. Small size: 8 oz may run out fast with heavy use. Needs elbow grease: Stubborn buildup requires extra effort.

Perfect For:

This exhaust tip cleaner is perfect for car owners who want to restore shine and protect their vehicle’s exhaust tips. It’s great for both tough cleaning jobs and regular maintenance.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

Keeping your exhaust system clean is key to a smooth-running car. A good cleaner can boost performance and save you money on repairs.

Choosing the right exhaust system cleaner can feel tricky, but this guide makes it easy. We’ll help you find the best option for your needs, so your car runs cleaner and stronger.

Here’s what to consider when buying:

Engine Type: Check if the cleaner works with your engine, like gasoline, diesel, or hybrid.
Ease of Use: Look for cleaners that are easy to add to your fuel tank, saving you time and effort.
Emissions Reduction: Choose a cleaner that reduces emissions to help you pass emissions tests with confidence.
Performance Boost: Pick a product that restores engine power and improves fuel economy for better driving.
Safety: Ensure the cleaner is safe for your catalytic converter, oxygen sensors, and other vital parts.
Regular Maintenance: Select a cleaner that prevents carbon buildup and keeps your system running efficiently over time.
Compatibility: Make sure it’s legal and safe for your vehicle, avoiding any warranty issues.

With these tips, you’ll find the perfect exhaust system cleaner to keep your car in top shape.