We've had some issues with our kitchen sink draining slowly over the last couple of weeks. No big deal, we did some household fixes on it (plunging, chemicals, etc), and it seemed to alleviate the problem. Until tonight, when the sink overfilled with hot brown water. This water was from the upstairs neighbor's dishwasher. Ugh. At this point, we are convinced that the condo is haunted by some captive water spirit since this is the third water issue we've had (broken water heater -> flooded carpet, upstairs toilet overflowing -> flooded bathroom).
The neighbor turned off their dishwasher and the sink has slowly drained, but it took over an hour. I'm guessing there is a clog way down the line, but so far we've had no issues with our dishwasher, bathroom sink, bathtub, or washing machine. A plumber is going to need to come and take care of this (it's a condo issue, not landlord, but he's taking care of us regardless).
The question I have is: is there anything I can do to make sure there's no more gross backflow in the meantime? The upstairs neighbors and us are going to avoid using our kitchens for the night, though that's not really fair if it continues beyond tonight. And I'm worried that even if I can shut off that drain that it will just find another place to empty into.