Please choose the correct ending to complete the given sentence: Home and Garden: [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).

Ending1: Set the kettle on the stove and turn the heat to high. To clean the drain, take the drain needle out of the kettle and push the needle up through the upper ring (which emits steam). Ending2: [substeps] Stir the water every half hour, so that when it boils, it simmers. Otherwise, it will become a sludge/roux that will pollute your plumbing fixtures. Ending3: Let it boil for a minimum of 30 seconds. [substeps] This process is known as washing the drain. Ending4: [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.

Answer format: ending1/ending2/ending3/ending4