Evaluate your situation Track down the impacted drain and extent of backup Examine if multiple drains are afflicted (signifies most important line situation) Try to find obvious water destruction or overflow Standard Do it yourself Methods Pour boiling h2o down drain Use plunger appropriate for sink/bathroom Try baking soda + https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/