Best Exhaust Fluid Cleaners

1. Hot Shot’s Secret Premium Defender DEF Booster Additive 8 oz – Treats 20 Gallons – Diesel DEF Treatment for Diesel Exhaust Fluid, Cleans and Prevents Crystal Build-Up

Hot Shot’s Secret Premium Defender DEF Booster Additive keeps your diesel truck’s DEF system clean and reliable. It prevents crystal buildup, reduces corrosion, and protects vital parts like injectors and sensors.

Add 1 oz per 2.5 gallons of DEF during fill-ups. Treats up to 20 gallons per bottle. Easy to use and works in cold weather.

2. Rislone 4720 Cat Complete Fuel, Exhaust and Emissions System Cleaner,16.9 oz. | Cleans Catalytic Converter, Reduces Emissions & Saves Gas

Rislone 4720 Cat Complete Cleaner keeps your car running smoothly. It cleans the catalytic converter, exhaust, and fuel systems, boosting power and performance.

Using it every 5,000 miles helps prevent costly repairs. It’s safe for all engines and won’t void your warranty.

Saves gas, reduces emissions, and works with all fuel types. Simple to use, great results.

3. Corrosion Technologies Xhaust & Soot Remover, Superconcentrated Cleaner Degreaser For Exhaust Soot, Belly Grime, Brake Dust & Bug Splats, Multi Purpose Aircraft & Fleet Cleaning Solution, 1 Gallon

Corrosion Technologies Xhaust & Soot Remover is a superconcentrated cleaner designed for tough jobs. It tackles exhaust soot, belly grime, and brake dust with ease. This multi-purpose solution works on aircraft and fleet vehicles.

It’s safe on various surfaces like metal, rubber, and plastic. The nonflammable formula is perfect for professional fleet maintenance. Use it for large-scale cleaning without worry.

This cleaner meets Boeing’s high standards and is trusted by experts. It’s ideal for precision detailing and heavy-duty grime removal. Get spotless results every time.

4. Cataclean Fuel & Exhaust System Cleaner – Pass Emissions Tests – Clear Check Engine Lights – Restores Catalytic Converters, DPF Filters and Cleans Fuel Systems, 16oz (120007)

Cataclean Fuel & Exhaust System Cleaner is a powerful solution for your vehicle’s fuel and exhaust system. It cleans and restores vital components, helping your car run smoother and cleaner.

This product reduces harmful emissions by up to 50 percent and improves fuel efficiency. It also fixes common engine problems like rough idling and hard starts, making your drive more enjoyable.

Safe for all vehicles, easy to use, and effective results. No engine alterations, just better performance.

5. Bardahl DEF-Shot 3353 – The Ultimate DEF Cleaner and Anti-Crystallization Diesel Additive Reducing DEF Consumption – 32oz

Bardahl DEF-Shot 3353 is a powerful cleaner for diesel exhaust fluid (DEF) systems. It prevents crystallization and reduces DEF use, keeping your engine running smoothly.

This additive removes DEF deposits, restores injector performance, and protects vital parts like the tank, pump, and lines. It ensures your exhaust system stays clean and efficient.

By reducing backpressure, it boosts engine power and improves fuel economy. Regular use prevents costly repairs and keeps your DEF system in top shape.

6. WoldoClean DEF Crystal Treatment 1:400 Ultra Concentrated 8.45 fl oz – Diesel Exhaust Fluid Additive SCR Cleaner, Treats 26.4 Gallons, Up to 5 Tank Refills

WoldoClean DEF Crystal Treatment is a powerful additive for diesel exhaust fluid. It comes in an ultra-concentrated formula, treating up to 26.4 gallons with just 8.45 fl oz. This 1:400 ratio ensures long-lasting performance.

It prevents crystallization in your SCR system and cleans NOx sensors. The integrated dosing chamber makes mixing easy and mess-free. Just squeeze and pour for the perfect dose.

This product is safe for heavy-duty trucks, RVs, and tractors. It works with Ford, Ram, Chevy, and GMC models. Simply add to your DEF tank during refills for a clean, efficient exhaust system.

7. 3 PCS Catalytic Converter Cleaner Auto Parts Engine, Exhaust System Pipe Carbon Removal Cleaner Treatment Additive Oil, Fuel System Treatment Oil Additive for Gas and Diesel Car

Revitalize your engine with this 3-piece catalytic converter cleaner. It reduces carbon buildup, improves fuel efficiency, and enhances overall performance.

Easy to use, safe for all vehicles, and cuts maintenance costs. Keeps your engine running smoothly and starting easily.

8. BIXMK 2pcs Catalytic Converter Cleaner Auto Parts Engine, Boost Up Catalytic Convertor Cleaner, Exhaust System Pipe Carbon Removal Cleaner, Fuel System Treatment Oil Additive for Gas and Diesel Car

The BIXMK Catalytic Converter Cleaner is a powerful solution for your car’s engine. It reduces carbon build-up in key parts like the catalytic converter, oxygen sensors, and fuel injectors. This boosts fuel efficiency and improves overall performance.

Pour it directly into your fuel tank—it’s easy to use. Works with gasoline, diesel, and hybrid vehicles. One bottle treats a full tank.

This cleaner is specially formulated for high-mileage engines. It fixes driveability issues like rough idles and hard starts. Your car will run smoother and last longer.

9. MotorPower Care Catalytic Converter Cleaner — Pass Emissions Test & Fix P0420 | Cleans O2 Sensor, EGR Valve & Exhaust System | Fuel Additive for Gas & Hybrid Engines, 8.45 fl oz

MotorPower Care Catalytic Converter Cleaner helps you pass emissions tests and fix engine codes. It’s a fuel additive that works for gas and hybrid engines.

Clears P0420 and P0430 codes by removing carbon deposits. Works on catalytic converters, O2 sensors, and EGR valves. No tools or mechanic needed.

Easy 40-minute treatment—just pour and drive. Safe for all engines and prevents costly repairs. Made in Germany with proven results.

10. RAYHONG Exhaust Pipe Cleaner Spray – Rust Remover & Shine Restorer, Fast-Acting Formula for Car, Motorcycle, RV – Safe Non-Corrosive (120 ML,Pack fo 1)

RAYHONG Exhaust Pipe Cleaner Spray is a fast-acting formula that removes rust, carbon deposits, and black smoke. It works on car and motorcycle exhaust pipes, metal wheels, and other metal parts. This cleaner is safe, non-corrosive, and eco-friendly.

Using it is simple and quick. Just spray, wait 30 seconds, scrub, rinse, and wipe dry. It saves you time and money by letting you clean your exhaust pipes at home.

The long-lasting protection prevents future rust buildup. Its lightweight design makes it perfect for home use or travel. Keep your exhaust pipes shiny and rust-free with ease.