Facial skin cleansers are cosmetic preparations whose properties must be specially adapted to reduce the risk of skin irritation after cleansing. Alkaline pH values for facial cleansing can cause irritation and skin dryness. The aim of this graduate thesis is to optimize facial cleansing by a rheological method to achieve the appropriate rheological properties with the pH within the appropriate range. In said lotion as emulsifier is used triethanolamine stearate, which is generated in situ by reaction between the triethanolamine from aqueous phase and the stearic acid from the oily phase of the lotion. Changing the proportion of triethanolamine and stearic acid changes the pH of the lotion but changes its rheological properties. The apparent viscosity of the lotion increased by decreasing the share of triethanolamine from 2% (m/m) to 0.25% (m/m) and decreasing by 5% (m/m) to 1% (m/m). Some rheological properties reflect the sensory characteristics that significantly influence the choice of cosmetic products by consumers. The composition of triethanolamine and stearic acid is not sufficient to optimize the rheological properties of lotions, it is also necessary to vary/add other constituents/substances with influence on the structure and stability of the lotion.