Why is the plate of the Sterilizer rusty? I only use for less than a month? How can I get rid of it?

All tap water contains mineral deposits that are invisible to the naked eye. When heated at high temperature, water evaporates and leaves a thin layer of mineral deposits (lime scale) on the heating plate. Such deposits look dirty and are often mistaken as rust. If deposits are not cleared regularly, it will affect the performance of your sterilizer. We recommend 2 ways of removing the lime scale residue: 1) Lemon Juice Cleaning, 2) Vinegar & Water Cleaning. You may also refer to the product manual for sterilizers for detailed information.