5. Polish chrome
Mineral deposits on chrome faucets and other tarnished chrome make haste in the presence of lemon–rub with a squeezed lemon half, rinse, and lightly buff with a soft cloth.
6. Polish copper
A halved lemon dipped in salt or baking powder can also be used to brighten copper cookware, as well as brass, chrome, or stainless steel. Dip a juiced lemon half in salt (you also use baking soda or cream of tartar for the salt) and rub on the affected area. Let it stay on for 5 minutes. Then rinse in warm water and polish dry.
7. Clean a stainless steel sink
Use the same method described to polish chrome, applied to any stainless sink.
8. Keep insects out
Many pests abhor the acid in lemon. You can chop of the peels and place them along thresholds, windowsills, and near any cracks or holes where ants or pests may be entering. For other ways to combat pests naturally, see 7 Steps to Chemical-Free Pest Control.
9. Make a scented humidifier
If your home suffers from dry heat in the winter, you can put lemon peels in a pot of water and simmer on the lowest stove-top setting to humidify and scent the air.
10. Refresh cutting boards
Because of lemon’s low pH, it has antibacterial properties that make is a good choice for refreshing cutting boards. After proper disinfecting (see: How to Clean Your Cutting Board) give the surface a rub with a halved lemon, let sit for a few minutes, and rinse.