There are many methods for cleaning a steam iron, two of which include dryer sheets or vinegar. When using a dryer sheet, set the iron on low and then use the dryer sheets to rub the bottom of the iron, removing dirt and grime.
To clean the inside of a steam iron, pour equal parts of white vinegar and water into the reservoir until the tank is two-thirds full. Set the iron on a medium-high setting and leave it to steam until all the vinegar evaporates. Fill the chamber with plain water, then turn on the iron to steam so that mineral deposits and traces of vinegar are removed.