A method for producing a washing agent portion unit having at least one receiving chamber surrounded by a water-soluble film, including the steps of: a) transporting a first water-soluble film in the direction of a dosing station; b) molding the first water-soluble film into the cavities of a deep-drawing die located below the water-soluble film, forming at least one cavity in the direction of travel of the film; c) filling the cavity by way of the dosing station with a first flowable washing agent preparation containing, based on its total weight, i) 20 to 80 wt. % surfactant; ii) 2 to 15 wt. % fatty acid; iii) 0.3 to 8 wt. % of the salt of a divalent cation; iv) 8 to 35 wt. % solvent; d) transporting the filled cavity in the direction of a sealing station; e) sealing the filled cavity with a second water-soluble film, and the washing agent portion.