Evaluate the specific situation Locate the afflicted drain and extent of backup Check if numerous drains are affected (suggests principal line concern) Try to look for seen water destruction or overflow Primary DIY Ways Pour boiling drinking water down drain Use plunger suitable for sink/toilet Test baking soda + vinegar https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/