Mineral film is a maintenance signal
White or brown deposits on the heating plate usually come from water minerals, not from successful sterilizing. Let the unit cool, unplug it, and follow the exact model's cleaning instructions before deposits become thick.
Do not improvise chemicals
Vinegar, citric acid, concentration, soak time, and rinse steps vary by manufacturer. Use only the method named for the appliance and keep cleaners away from feeding parts unless the instructions explicitly include them.
Change frequency based on the water
Harder water can require more frequent maintenance. Record how quickly scale returns, use the water type permitted by the manual, and do not assume distilled water is mandatory or prohibited without checking the model.
Dry before storage
After cleaning and rinsing, leave the reservoir and removable parts dry according to the instructions. Standing water and a closed warm appliance create a separate hygiene problem that descaling alone does not solve.