On some of the older refrigerators, the coils are in the back so its fairly easy to clean on those models. The refrigerator (Haier) in my home has the coils on the bottom facing the ground. There is a lot of dust on the coils, so whats the best way to clean them? Any special procedures? I tried using a vacumm cleaner but access is very limited. Also stuck a small broom and sweep it around but doesn't do much. Thanks.