Evaluate the Situation Track down the impacted drain and extent of backup Verify if various drains are impacted (implies principal line issue) Hunt for visible drinking water damage or overflow Primary DIY Methods Pour boiling h2o down drain Use plunger appropriate for sink/bathroom Check out baking soda + vinegar Remedy https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/