I'm trying to open the little drain valve at the bottom left of the fridge, in order to make sure it's open and perhaps blow through it. But the valve cover won't budge. It feels like I'm going to bust it. Anyone had this problem, and if so how did you solve it? And, just to be sure, does it come off clockwise or counterclockwise? (I've assumed ccw, but wanted to make sure.) Thanks!