Evaluate the problem Track down the influenced drain and extent of backup Test if many drains are influenced (signifies primary line issue) Try to find visible water harm or overflow Primary Do it yourself Methods Pour boiling h2o down drain Use plunger suitable for sink/bathroom Test baking soda + vinegar https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/