Evaluate the problem Locate the impacted drain and extent of backup Check out if multiple drains are influenced (implies key line challenge) Try to look for noticeable h2o hurt or overflow Simple Do it yourself Measures Pour boiling h2o down drain Use plunger appropriate for sink/bathroom Try baking soda + https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/