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Clean the Exhaust Fan
If the grille on your bathroom exhaust fan is clogged with dust, try a trick that's faster and more effective than vacuuming: Turn on the fan and blast out the dust with “canned air.” The fan will blow the dust outside. This works on the return air grilles of your central heating/cooling system too. Run the system so that the return airflow will carry the dust to the filter. You'll find canned air at home centers and hardware stores, usually in the electrical supplies aisle.
Caution: The cans contain chemical propellants, not just air. Don't let children play with them.
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Beat and Shake Area Rugs
Vacuum large area rugs at least once a week. But also take them outside three or four times a year for a more thorough cleaning. Drape them over a fence or clothesline and beat them with a broom or tennis racket. A good beating removes much more dust than vacuuming. Take smaller rugs outside for a vigorous shaking every week.