Is it normal for a car's exhaust pipe to be very clean?

[LeChase]

It is normal for a car's exhaust pipe to be very clean. Here are specific details about exhaust pipe maintenance: Waterproofing: When driving in the rain or going to a car wash, it is important to prevent water from entering the muffler, as it can cause rust and affect the exhaust pipe's functionality. Rust prevention: Remove the muffler, block the drainage hole, add rust-proof oil evenly inside the pipe, and then reinstall the muffler. Cleaning: The main substance discharged from the car's exhaust pipe is carbon deposits. Since the exhaust pipe is often exposed to the outside, similar to the car's interior, accumulated dirt inside can affect normal operation. Therefore, it is necessary to clean the exhaust pipe regularly.