Assess the problem Track down the influenced drain and extent of backup Test if many drains are impacted (indicates main line issue) Look for seen water damage or overflow Primary Do-it-yourself Steps Pour boiling drinking water down drain Use plunger appropriate for sink/bathroom Attempt baking soda + vinegar Alternative Take https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/