Add 200ml white vinegar, wait 20~30 minutes,and boil about 5minutes.Pour out the Vinegar ,then wash and wipe it with a clean cloth

Nueve&Five Gooseneck Electric Kettle with Thermometer， Black Electric Kettle 1L with Auto Shut-Off，1000W Hot Water Kettle of Stainless Steel， Pour Over Kettle for Coffee & Tea