A hardware store mill bastard file can help you remove the burr and return the edge of the blade to fair, so that less air is generated and water is released smoothly once again. Working from the back of the blade toward the edge, hold the file at as steep an angle as possible to help ensure that you remove as little material as possible. You will be removing some metal — and thus changing the size of the blade minutely. Every few strokes, check for the burr with your thumb, like you would when sharpening a knife. Again as with a knife, stop when you are done (the burr is no longer felt).