After using stainless steel tableware or kitchenware for a long time, even if it is usually cleaned again, the surface will lose its original beautiful luster. There's no expired ketchup at home? Well, mash a tomato that's going to go bad and try it. The effect is also very good. Using expired ketchup and perishable tomatoes is just to minimize waste, not only expired ones have effect. This method is only to restore the luster of stainless steel kitchenware. If your tableware or kitchen utensils are dirty, dark and greasy, you must first thoroughly clean them. This method is not a way to get rid of the dirty, greasy and Millennium paste.
Use out of date ketchup on tarnished, stainless steel tableware or kitchenware, such as: pot, lid, knife, fork, spoon, stainless steel coffee cup, kettle, pressure cooker, etc. Stay for 10 minutes, wipe it off with a paper towel, rinse it with hot water, and dry it with a cloth, and your stainless steel tableware will look brand new.
The acetic acid in ketchup reacts with metals, and that's the secret that it's as bright as new.