Remember an Info Please post on this awhile ago. I just did the baking soda and water paste on mine and it worked perfectly--didn't even use any elbow grease--just let it set a bit to 'loosen the gunk' (stitch witchery in my case):
If steam iron clogs from minerals in water, follow use-guide directions for cleaning, or use a commercial iron cleaner. A fine needle in the nozzle hole may open it again. Sometimes "steaming" will remove lint clogging the iron; fill with at least 1/4 cup water, set it to "steam", and hold in the air or set flat on wire rack over heat and moisture resistant surface like counter protective mat. Let steam until empty. Using only distilled water in steam irons helps avoid mineral buildup.
yes, I have the iron cleaner tube of stuff but I'm not about to go hunting for it today. I'm glad I found this instead :)
HTH
Butterfly