Chocolate is a mix of cocoa’s dark tannins and cocoa butter’s oiliness. On washable items, remove the grease with undiluted laundry detergent dabbed on the stain, let sit 5 minutes and rinse with warm water. Now apply color-safe bleach to the remaining water-soluble tannin stains. For almost any garment, our stain experts can almost always get the chocolate out.
From:: Chocolate stains.