If the scaling inside the kettle is really bad, increase the amount of vinegar in the mixture. Boil again.
If the scaling is really bad, leave the solution in the kettle longer.
Make sure that you do not scrub the heating element on the bottom of the kettle.
If there is any vinegar taste or smell left in the kettle, boil water in it again and dump it. This should get rid of it. Boil water multiple times if the vinegar smell or taste won’t go away.
Boil the water and let it soak in the kettle for around an hour. Dump the water and rinse the kettle. Alternately, you can use a lime instead of a lemon.
Let the solution soak for around 20 minutes. Then, pour out the solution and rinse with cold water. This should remove the scaling inside the kettle.
Leave the solution in the kettle to let it soak. Rinse the kettle with cold water.
Clean the outside every week or so. Because of the heating element, you cannot place your electric kettle in water.