Evaluate the specific situation Identify the affected drain and extent of backup Test if multiple drains are afflicted (suggests major line situation) Seek out noticeable h2o problems or overflow Standard DIY Ways Pour boiling water down drain Use plunger appropriate for sink/rest room Try out baking soda + vinegar Alternative https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/