This rumour has taken on many forms, claiming that Coca‑Cola, due to its acidic nature, can be used to clean toilets and corrosion from car batteries, loosen a rusted bolt and remove rust spots from car bumpers, remove grease from clothing, clean road haze from windshields, cook a steak, dissolve teeth and bake a moist ham. The last one, baking a ham basted with Coca‑Cola produces, is actually true and does produce a delicious gravy!
There is a small amount of edible acid present in many foods, including fruit juices and soft drinks, such as Coca‑Cola. These foods are not acidic enough to harm your body tissues – in fact, your own natural stomach acid is stronger. It is possible that the edible acid in any of these products could have the effects described, even though it's still quite safe to drink these products. However, we don't make any claims relating to other uses. Instead, we recommend using products specifically designed for cleaning or rust removal.