Evaluate the Situation Track down the affected drain and extent of backup Look at if several drains are afflicted (indicates key line problem) Hunt for visible water problems or overflow Basic Do-it-yourself Techniques Pour boiling h2o down drain Use plunger appropriate for sink/bathroom Test baking soda + vinegar solution Get https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/