Descale Sterilizer

I finally descale Dillion's sterilizer yesterday after procrastinating for few months. Its only my 2nd attempt in 7months.

We are suppose to decale it every few weeks. Purpose is to clean the sterilizer and to prevent the metal plate inside from rust.
Steps:
Squeeze half lemon on the metal plate
Pour 120ml of water (usual amount)
Turn it on to let it sterlize and descale