I often check a dark area of iron after scrubbing it with a brush and/or scrubber by rubbing my finger across the surface. Often my finger leaves a smear of dark stuff *exactly* over the dark spot. My finger does not leave much of a trail of anything over the areas that are thoroughly clean.
I know the spot needs more attention without testing with my finger, but what's up with finger scrubbing???
Pic's below:
1) pan as found
2) pan after molasses bath triage, lye bath, electro, scrubber, ss brush, and scrubber again
3) a few seconds later, this is the pan after molasses bath triage, lye bath, electro, scrubber (twice), ss brush, and finger scrub
