Evaluate the specific situation Track down the influenced drain and extent of backup Look at if multiple drains are impacted (indicates main line difficulty) Try to look for seen water problems or overflow Simple Do it yourself Methods Pour boiling water down drain Use plunger appropriate for sink/rest room Consider https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/