Beverage stains: Beverages containing sugar, which include wine or ginger ale, may appear to be to vanish. But don't be fooled - they should be there! As soon as the stain has become exposed to air, the sugar oxidizes and leaves an invisible stain, which finally turns yellow or brown. https://martinbsdwd.dailyhitblog.com/31502964/5-simple-techniques-for-bags-cleaning