Evaluate the Situation Locate the afflicted drain and extent of backup Look at if many drains are impacted (indicates primary line problem) Search for visible water destruction or overflow Simple DIY Steps Pour boiling drinking water down drain Use plunger appropriate for sink/bathroom Check out baking soda + vinegar Alternative https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/