Rinse thoroughly with boiling or hot water to wash away the dissolved debris. Risks to Your Plumbing While effective, caustic soda carries significant risks:

If you have previously tried to clear the drain with a commercial acid-based cleaner or bleach, do not use caustic soda yet . You must flush the drain thoroughly with water first to ensure no residue remains, or you risk a dangerous chemical reaction.

Use a wooden or plastic spoon until it fizzes and heats up. Pour: Carefully pour the solution down the drain. Wait: Let the mixture sit for 20 to 30 minutes .

Before starting, ensure you have :