How would you like an effective scouring mix that costs a few pennies, and can be safely used on all of your metal cookware — including expensive copper pots and pans? Want even better news? You probably already have this “miracle mix” in your kitchen. Simply combine equal parts salt and flour and add just enough vinegar to make a paste. Work the paste around the cooking surface and the outside of the utensil, then rinse off with warm water and dry thoroughly with a soft dish towel.