The answer to 'how to clean pipe' is to regularly clean and maintain your pipes to prevent clogs and ensure proper drainage. This typically involves using a drain snake or plumbing auger to remove any built-up debris, as well as using a chemical drain cleaner to dissolve and flush out any remaining blockages.
It's important to take safety precautions when cleaning pipes, such as wearing gloves and eye protection, and ensuring proper ventilation. You should also avoid using chemical drain cleaners if you have a septic system, as they can damage the system.