It's Been Ages Since One Has Had To Tell This Story
But "Since those early days, the brand name Persil has caused some confusion. In 1909, the English firm of Joseph Crosfield acquired the patent rights and trademarks of Persil for the United Kingdom and various British, Dutch, and Danish colonies. Crosfield was later absorbed by Lever Brothers, which in turn became part of Unilever. Today both Henkel and Unilever continue to market a product named Persil. In Western Europe, for example, Unilever owns the trademark Persil in Britain and France, while Henkel has Germany, Belgium, Luxembourg, the Netherlands, Italy, and Denmark."
Over the years Unilever and Henkel Germany have tried to purchase each other out of the Persil name brand, but each has never budged.