I'm assuming you have light oak or maple
In hardwood you don't. That black goes deep. Live with it or replace the
I would sand the area and try to lighten up the spots and blend them in with
a stain that would match the natural wood color and then put the clear
finish back over the area when dry.
Darken the entire floor color and then re-clear.
Sounds typical of iron tainted water reacting with tannins in the
wood. Oxalic acid reverses the reaction. Look in paint store for
wood bleach and check the label. Don't inhale dust when sanding after
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