Assess the problem Track down the influenced drain and extent of backup Look at if various drains are influenced (signifies primary line problem) Search for obvious drinking water damage or overflow Primary Do-it-yourself Steps Pour boiling drinking water down drain Use plunger suitable for sink/toilet Consider baking soda + vinegar https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/