Fish don’t like an acidic tank. You can add a pinch of bicarbonate of soda to make it less acidic. Bicarb is also good for cleaning the tank as it is safe and leaves no taint. Rinse the tank out carefully before refilling.
Suitcases and other luggage can get stored for months at a time and can get a musty smell, especially when left in the loft or attic. When you get your luggage down for a trip, sprinkle a little bicarbonate of soda inside the day before you pack, leave overnight and vacuum in the morning.
Bring copper, brass, or bronze up like new by mixing three parts bicarbonate of soda and one part lemon juice or white vinegar and cleaning with a soft cloth. But remember that if you’re polishing brass, you must make sure it is uncoated or it won’t work.