Assess the specific situation Identify the influenced drain and extent of backup Verify if many drains are affected (suggests main line situation) Look for noticeable h2o damage or overflow Fundamental Do it yourself Ways Pour boiling drinking water down drain Use plunger appropriate for sink/rest room Attempt baking soda + https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/