Summarize the following:
Before you begin, make sure the iron is unplugged. Allow it to cool off completely before you start. This can ensure you don’t burn or electrocute yourself when adding the vinegar. Plug in your iron again and set it to the steam feature. The heat setting should be at medium to high. Allow it to heat for at least 5 minutes. This flushes out mineral deposits and makes it easier to clean the ducts. Fill the reservoir with one cup (240ml) plain, distilled water. Turn on the iron again and hold the steam button again. This will clear any traces of remaining mineral deposits or vinegar.

Summary:
Unplug and cool the iron. Heat up your iron. Rinse the reservoir.