Assess the Situation Find the influenced drain and extent of backup Look at if numerous drains are affected (indicates principal line situation) Try to find seen drinking water destruction or overflow Simple DIY Measures Pour boiling water down drain Use plunger suitable for sink/bathroom Check out baking soda + vinegar https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/