I use a small, oscillating fan in my kitchen and it seems that overtime the cover gathers a greasy film with dust attached! To quickly and safely clean this off, I unplug the fan and remove the cover. I take the cover outside and spray it with FUME FREE oven cleaner. After it sets for a few minutes I then spray it off with the water hose. It takes every bit of the grease and dust off without me having to scrub.
A cheaper alternative to oven cleaner is ammonia. It will cut through grease and dirt like you wouldn't believe! I keep a spray bottle of about 1/4 cup ammonia to a quart of water handy at all times. It cleans practically anything - and for pennies!
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