Look up. If you see a ceiling fan, it is probably dirty. Today, consider cleaning it. Typically crud builds up on the rotating side of the blade. Let it go long enough and experience a dust shower every time you flip the switch.Many might be tempted to take a feather duster to this mess. Don’t. That approach spreads dust everywhere, especially on the top of your head. Take the vacuum attachment to the filthy fluff first. After the bulk of the dust is removed, go over each blade and the center with a damp cloth. Don’t forget to give the light bulbs a once over if the fan has lamps.