French competition authorities are investigating Unilever and Reckitt Benckiser over price-fixing on household cleaning products.
The cleaning product makers are among nine international businesses caught up in a cartel investigation, which examines increases in price that were said to be agreed in 2005.
Unilever, whose brands include Cif cream cleaner and Domestos bleach, confirmed that it was co-operating with the French authorities over the investigation that began last year.
It is thought that SC Johnson, the US maker of Pledge furniture polish and Glade air fresheners, tipped of the French Authorities, according to Le Figaro newspaper.
If they’re found guilty, the companies risk fines of up to 10 per cent of their global sales.