how to clean exhaust pipe inside

Shoving water inside an exhaust to clean it?

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I have seen this too.

We had a Mitsubhishi Pajero 2800 and my driver used to clean the exhaust in the same way. Pour water into the exhaust pipe, then rev the engine and I could see black water flow out. This was repeated 3-4 times.

I asked him why and he said its done because he wants to get the PUC done. And also by doing this – the black smoke from the exhaust also reduces .

The black color is due to the carbon deposits inside the exhaust but anyone tell us if this is the correct thing to do ?

Hi guys, I had taken my car for a body wash to the nearby service station. I observed something that was quite shocking. I saw the service centre boys shooting water into the silencer of a scorpio .