Assess the Situation Track down the afflicted drain and extent of backup Test if many drains are influenced (indicates key line challenge) Try to look for visible h2o destruction or overflow Fundamental DIY Steps Pour boiling water down drain Use plunger suitable for sink/rest room Attempt baking soda + vinegar https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/