timely thread for me. Both of the more recent irons I've bought (need both up and down stairs) say in instructions not to use distilled water. But we have such "hard" water that I've been working on one of my steam irons trying to get the mineral deposits out now for about a week--I did find a product that is made to run through your steam iron to get the gunk out--but I still have it bubbling out of the steam holes so don't want that on my fabric. Has anyone used vinegar in their irons to clean out mineral build-up?