Assess the Situation Track down the affected drain and extent of backup Check if many drains are impacted (suggests primary line challenge) Seek out obvious water problems or overflow Fundamental Do-it-yourself Ways Pour boiling water down drain Use plunger suitable for sink/rest room Attempt baking soda + vinegar solution Take https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/