This method provides for the H2O-containing saponification product being injected into the already melted soap at temperatures of 275°-325°. By this means, the H2O and part of the unsaponifiable substance is eliminated. The remaining unsaponifiable substance is then distilled off in a high vacuum under pressures <2 mm. Hg. Two stills have to be passed, the 2d preferably acting as film evaporator.