Dunking blackberries, strawberries, raspberries, or blueberries in a solution of three parts water to one part white vinegar kills off mold spores and bacteria. Rinse, dry, and store in an airtight container lined with paper towels to soak up moisture, and they'll keep for an extra week.
Three Hints for Fresher Berries and a Cleaner Bathroom

Berries taste great but go bad fast, and a quick vinegar dunk can buy them an extra week in the fridge.
Make Berries Last Longer
Stop Pens From Leaking in a Purse
Storing ballpoint pens inside an old plastic toothbrush container keeps a leaking pen from ruining the inside of a purse.
Tackle Tub Mildew and Soap Scum
A vinegar-and-water spray left to sit before wiping clears mildew buildup in the tub, while a baking soda and dish soap paste scrubbed in with a toothbrush handles stubborn soap scum.
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This edition is part of the Genius House Hacks archive: 20+ years of tips, rebuilt from the original Handy Hints newsletter. Browse more hacks →