Yes, yes, you clean the inside of the refrigerator, but are you remembering to clean the coils and the tray below it? Frost-free refrigerators (by far the most common) contain an electric coil in the freezer that melts frost every four hours, according to May. The resulting water drips into a pan, which evaporates with the help of warm air produced by the refrigerator’s compressor. But if that pan is filled with dust, your refrigerator is blowing that dust into your home. (Not to mention, the tray also catches anything that’s spilled in your refrigerator, so there may be mold on it if you haven’t cleaned it.)
Newer refrigerators may not have a tray underneath, but their coils on the back of the machine need to be dusted off regularly. If you have a built-in refrigerator, you should be able to lift off the grill and vacuum the coils of the condenser from the front. Be sure to turn off the power to the refrigerator before doing this, and according to SubZero, the refrigerator manufacturer, wear gloves to avoid hurting yourself on the sharp edges of the coils.
Solution: Clean behind your refrigerator regularly. Check your manufacturer’s instruction manual to determine whether there is a tray and to learn the best cleaning methods.