...Don't put "cleaning behind/under the refrigerator" on your spring cleaning to-do list. You'll think that it'll make you feel virtuous to do such a thorough cleaning, but in fact, upon wrestling the large appliance back and coming face to face with the grime that is lurking not feet from your food preparation area, you will feel sickened and hopeless. You will want only to shove the fridge back from whence it came, stand against it, gasping, and pray that what you just saw will be erased from your mind.
Then you will eat raspberry oatmeal bars for breakfast. Possibly just with coffee, possibly with a Jack Daniels chaser. Depends on how gross it actually was back there.