Wiping windows (or a car windshield) with a sponge dipped in saltwater, or a small cloth bag filled with salt when no sponge is handy, keeps the glass frost-free.
Three Salt Tricks for Frosty Windows and a Clean Kitchen

Salt does a lot more than season food, and one of its best cold-weather tricks is fighting frosted windows.
Fight Window Frost With Saltwater
Make DIY Dishwasher Soap
Running out of dishwasher soap doesn't have to mean a store run: three to four drops of hand soap mixed with a spoonful of baking soda and a pinch of salt makes an effective substitute.
Clear a Smelly Drain
A cup each of white vinegar, baking soda, and salt mixed together and poured down a clogged, smelly drain will fizz; letting it sit about ten minutes before flushing with hot water clears out hair, grease, and odor.
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