Assess the Situation Locate the afflicted drain and extent of backup Examine if multiple drains are affected (implies primary line concern) Hunt for visible water problems or overflow Basic DIY Methods Pour boiling h2o down drain Use plunger suitable for sink/rest room Try baking soda + vinegar Remedy Clear away https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/