The ancient Greeks used clay and stone; the Romans, sponges and salt water. Americans made do with rags, newspapers or mail-order catalogs until 1890 when the Scott brothers popularized toilet paper on a roll.
Only in the past decade have grownups seized upon moist “flushable” wipes similar to those that clean baby bottoms, a product that has become a prized asset in a flat market. Accelerating sales are demonstrated inside the world’s sewers, where tons clog equipment. From New York to London, the hygiene fad costs governments millions of dollars a year.