Polish chrome and copper
A halved lemon dipped in salt or baking powder can be used to brighten copper ware, as well as brass, stainless or chrome steel. Put a juiced lemon half in salt, you can also use cream of tartar or baking soda instead of the salt and rub on the affected area. Let it stay on for ten minutes. Then rinse in warm water and polish dry.
Keep insects out
Many pests hate the acid of lemon. You can chop of the peels and place them along thresholds, windowsills, and near any holes or cracks where ants or pests can be entering.
Make a scented humidifier
If your house suffers from dry heat in the winter, you should put lemon peels in a pot of water and simmer on the lowest stove top setting to humidify and scent the air.