Hello, good evening or good morning to everyone. I want to ask what other alternatives there are to clean the exhaust pipes that don’t involve antifreeze, since it’s toxic and I don’t have a place to use it. I want to find another effective way to remove the carbon from the inside. Another alternative could be an ultrasonic tank, but which product could I use?

You can try to use:

• Hot water + strong degreaser / alkali cleaner (parts cleaner or degreaser safe for metals (e.g. “Simple Green”, or industrial degreasers) diluted with hot water)
• Oven cleaner / heavy duty spray cleaner (Spray or soak inside the pipe with a strong cleaner (oven cleaner, or “Easy-Off” etc.), let sit, then scrub / rinse)
• Mechanical removal (Use brushes (steel or wire brush, flexible brush), scraping tools, or abrasive media (e.g. soda blasting, or very fine media)

You can also use Ultrasonic cleaning if you have the equipment for that.

Dawn powerwash and lots of scrubbing patience for the absolute non toxic way to get it done....

No to hijack the thread but what exactly is the reason for cleaning the inside of the pipe out? I have been in the hobby for 20+ years and never once cleaned a nitro pipe.

In a pipe there are holes. The build up carbon in those holes will have an influence on the gas flow giving a less performance.

Ya good point..... maybe I will start doing this.

If what Reolof says is true, then it's important to keep it clean on the inside.

I use a foam kind oven cleaner. Pray it inside the pipe, let it work for 30 minutes and flush it out with tap water, you will be amazed how much black dirt can come out.

On the outside I use the same stuff and after 30 minutes wipe it off with a Brillo pad

I'm actually going to try this this weekend.... good info here.

Make sure it’s not oven cleaner with sodium hydroxide (Lye). If it is I would be very careful not to leave it on for too long as it will eat away at the aluminum.

Carbon Off. I get it at Gordons Food Service. Although it is toxic.

The one that works best is this:
Pepe Group Poly Liquid 2400GR Exhaust Cleaner • Team NCRC

The exhaust will come out totally clean.

Anybody ever test how much exhaust carbon gunk it takes to reduce engine performance ? All that cleaning might be in vain...Are there nitro fuel additives that also clean the exhaust while running the engine ?

You can hear it clearly. After cleaning the pipe the sound is louder. A basic thing most drivers (cheaters) with a new exhaust do is to ream up the 4 small holes on the inside to get more performance.

Sound might be different, but the dyno graphs are the real proof of performance increase.