To prevent mineral scale on the water heater inside your Baby Brezza Formula Pro Advanced, follow these easy steps:1. Remove the water tank, empty it and fill it with 20oz/600ml distilled vinegar & 20oz/600ml of purified water.2. Place the water tank on the base of the machine & place a cup larger than 10oz/300ml under the funnel.3. Select “10oz/300ml” with the “oz/ml” button, then press the “water only” button to dispense.4. Empty the cup, place back under the funnel, then press the “water only” button again to dispense another 10oz/300ml.5. Now unplug the machine, remove the water tank, and empty it. Let the machine sit for 4 hours.6. Wash, rinse and fill the water tank to the max line with purified water, then place it back on the base.7. Plug in the machine, place a cup to catch 10oz/300ml water and use the “water only” button to run a 10oz/300ml cycle. Dispose of the water dispensed in the cup and then repeat this step to run the entire tank of purified water through the machine. When the “Low Water” indicator turns on, you’re done rinsing.8. Refill the water tank with purified water and return to normal use