Ads for detergents are often based around getting clothing "as white as new," but in order to whiten old clothes, bleaches and fluorescent agents are added.
洗衣粉的廣告裡，經常以洗後衣物「潔白如新」為訴求，為了要把舊衣洗得像新的一樣，洗衣粉裡加入漂白、螢光劑。