Salt

21.  Adding a little salt to the water when cooking foods in a double boiler will make the food cook faster. 
22.  Use a mixture of salt and lemon juice to clean piano keys. 
23.  To fill plaster holes in your walls, use equal parts of salt and starch, with just enough water to make stiff putty. 
24.  Rinse a sore eye with a little salt water. 
25.  Mildly salted water makes an effective mouthwash. Use it hot for a sore throat gargle.