Evaluate your situation Track down the impacted drain and extent of backup Examine if several drains are impacted (indicates primary line challenge) Try to find noticeable water problems or overflow Primary DIY Measures Pour boiling drinking water down drain Use plunger appropriate for sink/toilet Check out baking soda + vinegar https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/