Behind fridges, washing machines and big cabinets is where dust goes to retire. You rarely see those spots, so layers build up: hair, fluff, old wrappers, maybe even a long-lost spoon. In some cases, you might also find moisture, small leaks or insect activity there.
Pulling appliances out occasionally (carefully) and having a quick look lets you catch things early. You might notice a small water trail from a washing machine hose, soot near a fridge coil, or signs of rodents.
Clearing dust from coils on fridges and AC units also helps them run more efficiently, because they can release heat properly. Again, small, periodic effort protects both hygiene and appliance health.
