The answer to 'how to clean sewer line' is to use a professional sewer cleaning service. Sewer lines can become clogged with debris, grease, and tree roots over time, which can lead to backups and other plumbing issues. While there are some DIY methods for clearing minor clogs, it's generally best to call in a licensed plumber to properly clean and maintain your sewer line.
Professional sewer cleaning services have specialized equipment like high-pressure water jets and augers that can effectively remove built-up material from the pipes. They'll also be able to identify and address any underlying problems that may be causing the clogs. Trying to clean the sewer line yourself can be dangerous and may even make the problem worse if you don't have the right tools and expertise.