A bottle sterilizer ensures that your baby’s bottles are impeccably clean. Over time, minerals contained in water will build up inside the sterilizer. To keep the device working properly, you must clean and descale it regularly following manufacturer instructions.Take out the removable parts from the sterilizer to wash them.Pour any water out of the base of the bottle sterilizer to empty it completely. Mix 50ml white vinegar with 100ml cold water into the base of the sterilizer. Allow the white vinegar to sit in the unit for two hours or until you see the mineral scales dissolve.