The answer to 'how to clean repiping' is to thoroughly flush the new plumbing system after it has been installed. This helps remove any debris or contaminants that may have accumulated during the repiping process. To clean the repiped system, turn on all faucets and fixtures and let the water run for several minutes to clear the lines. You may also need to clean aerators on faucets to remove any sediment.
It's important to clean the repiped system to ensure optimal water flow and quality. Regular maintenance, such as flushing the system every 6-12 months, can also help prevent future clogs or issues.