Clean bottoms of iodized copper pots with sprinkled on salt and ½ a lemon. This also works on rust stains.
Rubbing alcohol on cloths will disinfect most surfaces and costs much less than Mr. Clean wipes.
You can clean windows with vinegar in a spray bottle, then wipe clear with a dry newspaper.
Brushing your teeth with baking soda and water paste will whiten your teeth too.
Hydrogen peroxide when swished in your mouth will whiten your teeth and works as a cheap disinfecting mouthwash.