The magician shows a box of washing detergent along with three dirty handkerchiefs. The dirty handkerchiefs are placed into the box. When the magician turns the box upside down and removes the handkerchiefs they are pulled out clean. At this point the audience thinks that they know how it is done and that the dirty handkerchiefs are still in the box and the clean ones were in there from the start. The magician then takes the box and tears it to pieces proving that the handkerchiefs are not inside and stunning the audience.
The trick includes 6 boxes so that it may be performed multiple times.