ACK! My bathroom floor (usual vinyl crappy stuff of apts.) is turning black!?

I’ve tried EVERYTHING – bleach cleaners, disinfectants… what will get rid of this? Nothing? If not – how do I deal with my rental company to get them to replace it? Do rental companies allow you to split costs? I’ve done nothing unusual that would have damaged the flooring – I thought it might have been mold/mildew, but since nothing is taking away the black color I’m at a loss.

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