Two companies own the rights to the "Persil" brand. Henkel in Germany (Europe,South America and several other parts of the world), and Unilever in the UK (formally Lever Bros., sold in the UK and other parts of former "Empire"). Over the years each company has tried to buy out the other, but neither side wishes to give in, so that is that.
The story of how both a German company and a British one came to own the same brand is a long one, and involves twists/turns and even Nazi Germany IIRC.
Henkel Persil is not sold in the United States outside of Miele dealers (Miele imports and distributes the line along with other Henkel products). UK Persil is not sold in North America period, though many British expat online stores will ship.
L.