When done mopping, I attempt to empty out the remaining water from the bin. But, because of the way the opening is situated, it is impossible to get all of the water out.

What's more, if I don't mop for a week (or weeks) all of that water/moisture is sitting in the bin. 

I can leave the bin unattached and the plug open, but I tried that and even after a day, there was still watter left in the bin.

I can't leave the bin plug open for longer, because then I can't attach the vacuum bin and use the device as a vaccum. I'm concerned that, as the water sits, organisms multiply and will eventualy gum-up whatever pumps out the water.

Regardless, what does tp-link advise customers do after mopping is complete? Should I add a bit of white vinegar to keep mold from growing?