These just appeared one day. They are small, like the outline of a match head, and orange in color. They are a bear to remove. I got after them with some scotchbrite and didn't so much as lighten them up. Any ideas?
I hit it with some Vitamin C pills and all the elbow grease I could muster. They may have lightened a tad, but not much. I would say they didn't react strongly to that at all.
How can rust just appear like that? There weren't any metal objects on the stairs. I do have metals in the pool that I have to maintain with sequestrants.
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