Evaluate the problem Find the affected drain and extent of backup Check if many drains are affected (suggests main line difficulty) Hunt for visible water problems or overflow Simple Do it yourself Steps Pour boiling water down drain Use plunger appropriate for sink/bathroom Check out baking soda + vinegar Answer https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/