I have to confess, my steam iron is a Proctor Silex that I bought in 1967. Although it's not so pretty anymore, have literally worn the paint off the handle in places, it works like a dream. It has never had a drop of water in it that didn't come out of a DISTILLED bottle.
Oh, yes, ladies tell me all the time, it says I don't have to use distilled water in my iron or it says 'don't' use distilled water. Of course not, within a year, if you sew (my fun game of choice) or quilt and use it maybe every day or every other day, it will be spitting.
I've never even use a cleaner inside, don't have too because you never get lime buildup with distilled water. You see, the iron makers are just trying to sell irons. It's kind of like using half the detergent in your washer or dish washer. Less does just as well, especially in the dish washer, that's what frosts your glassware, too much.
Oh, I have the other iron given to me at a kitchen shower for our wedding, it's a GE, no steam. That was 1962. I don't use it too often but I do use the Procter Silex nearly every day. I think back then it was probably $5. My friend bought a $100 Rowenta, last year. She dumped it in the trash in December, it was spitting already.
My DMIL was a seamstress for 70 years, the best advice she ever gave me was USE DISTILLED WATER.