I just used my iron X. I barely got any results. I got the same result that I get from my toilet specific cleaners. I bet I would’ve done better if my iron X wasn’t old. It’s possible I’ll get some new and try again because no products I’ve used yet can fully defeat the stains.
I used up the last of my old Iron X on the toilet. It performed maybe similar to a mortal toilet cleaner. I think I may get a new bottle to see if I get any success at removing the stains