Step #1
Pour half water, half white vinegar into your iron. (Vinegar will not hurt your iron). Fill the iron, turn it on and let it sit for an hour. The auto-shut off will turn it off eventually, this is ok, just let it sit to soften the crud.
Afterwards, take the iron to the sink, hold it upright and shake it gently to loosen the crud. Then turn the iron upside down and pour the vinegar out of the iron. Fill with water, shake and pour the water out. If you've never cleaned your iron before repeat step #1 two more times.
Step #2
Add white vinegar to the iron, fill it to the top. Turn the iron on high, turn the steam to high and hold the iron horizontal over your sink.
Let the steam vent out until the iron is about half empty of vinegar. Then turn the iron upright, shake it gently as before and turn it upside down to pour the remaining vinegar out of the iron.
Fill with plain water, empty, fill with water again and repeat the process of venting steam until you're satisfied all the vinegar is out of the vents. Now you've just added another few years of service to your iron!
Note: This is the cutting board my husband made for me. A tupperware colander fits perfectly. I place a plastic cutting board on top of the colander and slide the veggies into the bowl of the colander as I go.