Assess your situation Identify the influenced drain and extent of backup Look at if multiple drains are impacted (implies key line difficulty) Try to find seen water problems or overflow Standard DIY Ways Pour boiling water down drain Use plunger appropriate for sink/bathroom Try baking soda + vinegar Remedy Take https://www.kawatan.net/how-to-find-emergency-drain-cleaning-and-plumber-services-in-etobicoke/