No, baking soda will not defunk your frig, and mayo does not hasten the spoiling of salads. Lots more, too. Kitchen Myths Debunked explains the truth behind many kitchen falsehoods. I totally disagree with her on the bananas, as I find that refrigeration ruins them, and I have my own secret to keep guacamole from turning brown: use a tablespoon or so of lemon juice per avocado. Delectable flavor and pleasant appearance.