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Remove the cover. Boil another 2–4 cups of water (or run the hottest tap water for 1–2 minutes) and flush the drain thoroughly.
Let the mixture work. For tough clogs (e.g., hair and soap), wait 30 minutes or even overnight. You’ll hear occasional fizzing. unclog drain with baking soda
Slowly pour the boiling water directly into the drain to soften and loosen grease, soap scum, and debris. Remove the cover