Unblock a drain

Pour 1/3 cup of baking soda into the drain followed by 1 cup of white vinegar. Immediately seal the drain with a plug and leave 1 hour. Lastly, pour boiling water down the drain.
Pour 1/3 cup of baking soda into the drain followed by 1 cup of white vinegar. Immediately seal the drain with a plug and leave 1 hour. Lastly, pour boiling water down the drain.