"Yes, you have a vent fan. Remember when you were complaining about the lack of circulation? Thought that'd be a good idea too."
She grins when she gets the box open. "Oh, good, a longer one. And it's neutralizer purple, too! You know me well... or have you been monkeying around with the goo?"
It'd explain the stains. This is too much for the problem to be the Warehouse messing with the goo hose.