Polish chrome - Mineral deposits on chrome faucets & other tarnished chrome make haste in the presence of lemon--rub with a squeezed lemon half, rinse, and lightly buff with a soft cloth.
Polish copper - A halved lemon dipped in salt or baking powder can also be used to brighten copper cookware, as well as brass, copper, or stainless steel. Dip a juiced lemon half in salt (or baking soda or cream of tartar for the salt) & rub on the affected area. Let it stay on for 5 minutes.
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Then rinse in warm water and polish dry.