What Causes Stains on Stainless Steel Cookware?

Acids

• Extended exposure to acidic foods, such as tomatoes, coffee or citrus fruits, can cause stainless steel to develop an "off" color. While this does not affect cooking performance, it does diminish the appearance of the pan. To remedy this situation, dip a damp sponge in baking soda to form a stiff paste, and then gently scrub the surface, moving with the direction of the grain. Let the paste dry, and then wipe the residue away with a damp sponge.

Water Stains

• When pots and pans boil dry, they develop an unattractive ashen tinge; as the water evaporates, it leaves behind minerals that cover the metal surface in a chalky white film. To remove these unsightly stains, soak the pans in 2 cups of distilled white vinegar for 20 to 30 minutes, then rinse them first with hot, sudsy water, then with plain, cold water from the tap.

Oils

• Cooking oils, grease, butter and nonfat sprays lubricate stainless steel pans and keep foods from sticking to the surface. However, when exposed to high heat, these materials tend to thicken, leaving pans covered in a gummy layer of brown residue. These discolorations can be removed by scouring the affected areas with a gentle homemade scrub. Pour identical amounts of flour and table salt into a small bowl and add just enough white vinegar to make a stiff paste. Work the mixture into any stained areas, wait five minutes, then rinse it off with tepid water and wipe the pan dry with a clean towel.

Unknown Stains

• To remove stains and discolorations that seem to appear from nowhere, rub the affected area with a sponge that has been dipped in white vinegar, then rinse the pot with hot, soapy water and repeat. For stubborn stains, fill the pan with water, then stir in 2 tablespoons of baking soda and ½ cup of distilled white vinegar. Place the pan over high heat and let the mixture come to a boil. Wait 10 minutes, then turn off the heat. Give the pan a gentle scrubbing with a stiff-bristled brush once the mixture cools; the marks should come right off.