Robot vacuum wheels have permanently stained my hardwood floors

[smcallah]

@BridgelessWS

Any chance this is an electrical arcing issue?

That’s an interesting theory, but I don’t think this is the case. Mine is one of the ones that leaves a residue on the floor that I can just rub off with my fingers or faster with a magic eraser. So it really seems to be something from the wheels being left behind, which reacts more with certain floor finishes or carpets.