Assess the problem Identify the affected drain and extent of backup Examine if a number of drains are influenced (signifies principal line situation) Hunt for seen water damage or overflow Essential Do-it-yourself Measures Pour boiling h2o down drain Use plunger appropriate for sink/toilet Check out baking soda + vinegar Resolution https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/