[header] How to clean a kitchen drain [title] Boil the water. [step] Start by boiling 3 cups (710 ml) of water in a kettle or in a pot over the stove. Bring the water to boiling temperature (212 degrees fahrenheit , 100 degrees celsius). 
[title] Pour the hot water down the drain. [step] Do this slowly and carefully, making sure not to spill any of the water on you.