Why has my stainless steel pan developed a white film or chalky residue on the inside?
In some localities water contains minerals that may be deposited on the inside surface of aluminum pans, causing some discoloration. This does not affect the use of the utensil nor the food prepared in it. Minerals may react with the fats left behind from cooking and also with soaps or dishwasher detergents to produce a chalky white, or milky stain called milkstone. These stains can be removed with an acid like vinegar or lemon juice.
