We just moved into a house.

The last owner kept a rubber-backed carpet in front of the toilet.
Something from the back of the carpet
discolored the vinyl floor covering.

The the floor covering is whit-ish.
The stain, ( in the shape of the carpet) is orange.

So far, my wife's tried detergents, and bleach....
.... doesn't touch it !

Is my only recourse gonna be an exacto knife ??
rj