I love my Velocity Iron with built-in steam generator—but not when the soleplate is gunked up with black residue from fusibles and leaves it behind on my latest project!
I use a sponge to apply Iron Off to the soleplate—not too close to any smoke alarm (ask me how I know) and when the gunk is gone, I run the iron over a stack of paper towels and shoot some steam through the vents to make sure there is no residue—before I use the iron on something else. Works like a charm!! Give it a try! I buy several tubes at a time--when there's a good sale on notions or I have a coupon to use.
I'm off to Quilt Market tomorrow. I'll keep you posted on anything exciting that I find as I walk the aisles (my feet hurt already!).
Keep Sewing and Smiling!