Even bathroom mops tend to converge on that same flavour.

I did a stint as a grounds keeper at a theme park, so I’m familiar with mop water from bathrooms to back offices, to fast food floors, grocery stores, commercial garages, and office space. I even mopped a laser tag room — that one was epic, you have no idea how much stuff people lose while playing laser tag, I found two watches and tons of change, all sorts of stuff. Dusty as heck though.

As I mentioned elsewhere, no, I have not experienced bar mop water except one time when drunk, so not a fair sample.