Evaluate the specific situation Track down the affected drain and extent of backup Look at if numerous drains are impacted (implies key line concern) Look for noticeable drinking water damage or overflow Primary Do it yourself Techniques Pour boiling water down drain Use plunger appropriate for sink/toilet Try out baking https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/