Evaluate your situation Track down the influenced drain and extent of backup Check out if several drains are affected (suggests principal line problem) Look for seen h2o hurt or overflow Basic Do-it-yourself Ways Pour boiling water down drain Use plunger appropriate for sink/rest room Try baking soda + vinegar Remedy https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/