It's a very long story that has been told here in group many, many times.
Long story short is original inventors of Persil (Henkel) rather than build new plants and all that goes with it in UK and other parts of Europe licensed name to Crosfields soap company.
Lever Bros. was Crosfields arch rival (literally with plants almost right next door) responsible for Sunlight, Lifebouy and other soaps. Sir Arthur Crosfield at some point was fed up with soap business and sold that part of his company to Lever Bros, this included "Persil".
Ever since the two companies, Henkel and Unilever (once Lever Bros.) have owned rights to Persil name. Over years each has attempted to buy out other, but it never takes.
As for who owns what Wiki has answers to that query:
"Unilever markets Persil in the United Kingdom, Ireland, France, Latin America (except Mexico), Malaysia, Singapore, China, and New Zealand (but not Australia) since acquiring rights to the brand (one of its first such acquisitions) in 1931. (The "Small and Mighty" product line—a highly concentrated liquid detergent formulation—is found only in these markets.) Unilever also sells Persil in France. In this market, the brand focuses on "natural" ingredients and "skin-friendly" formulations.[10] Persil, Skip, Breeze, Surf, Ala and Rinso serve as the local version in these markets of Unilever's other international detergent brand Omo.[11]"
and:
"Henkel AG manufactures, distributes, and markets Persil in Germany, Poland and most of Europe, Egypt, Lebanon, Saudi Arabia, Syria and the United States."
"Henkel markets Persil under the name "Dixan" in Greece, Italy and Cyprus; and under the name "Wipp" in Spain and China. In Belgium, where both Henkel's Persil and Dixan can be found at major retailers, the Persil brand name is given priority by Henkel in its marketing. Henkel sells its Persil formulation in France under the name "Le Chat", as Unilever owns the licence to the Persil trademark in that country."
WITH Unilever having announced the potential closure of its Crosfields factory, centuries of soap-making in Warrington could be set to come to an…
www.warringtonguardian.co.uk