Assess the specific situation Locate the affected drain and extent of backup Look at if multiple drains are affected (suggests principal line situation) Search for noticeable drinking water damage or overflow Standard Do-it-yourself Ways Pour boiling drinking water down drain Use plunger suitable for sink/bathroom Consider baking soda + vinegar https://www.kawatan.net/how-to-find-emergency-drain-cleaning-and-plumber-services-in-etobicoke/