NOVELTY - Producing fatty acid alkyl esters comprises transesterification of fats or oils with alkyl alcohols, where: the fats or oils, the alkyl alcohols and a catalyst are separated into a light, ester-rich phase and a heavy, glycerin-rich phase in at least a reaction zone (1, 4); the fatty acid alkyl esters are separated from the light and ester-rich phase; and the fat or oil and/or raw alkyl ester produced by transesterification and/or biodiesel end product obtained after the separation of byproducts are contacted with an agent containing one or more alcohols.    USE - The method is useful for producing fatty acid alkyl esters.    ADVANTAGE - The method does not use additional equipments for washing the product, hence inexpensive. The method avoids the formation of sterol glycoside containing precipitates.    DETAILED DESCRIPTION - Producing fatty acid alkyl esters comprises transesterification of fats or oils with alkyl alcohols, where: the fats or oils, alkyl alcohols and a catalyst are separated into a light, ester-rich phase and a heavy, glycerin-rich phase, in at least a reaction zone (1, 4) with a mixing reactor (2, 5) and a separator (3, 6); the fatty acid alkyl esters are separated from the light and ester-rich phase; and the fat or oil and/or raw alkyl ester produced by transesterification and/or biodiesel end product obtained after the separation of byproducts are contacted with an agent containing one or more alcohols containing at least two hydroxyl groups with low solubility in nonpolar liquid phases. INDEPENDENT CLAIMS are included for:    (1) the agent for preventing sterol glycoside containing precipitates in the production of fatty acid alkyl esters; and    (2) a device for producing the fatty acid alkyl esters comprising: the reaction zone with mixing reactor for mixing fats or oils with alkyl alcohols and a separator for separating the mixture into light, ester-rich phase and heavy, glycerin-rich phase, and a wash column (21) for the separation of fatty acid from the light, ester-rich phase; and a mixing device (26, 27, 28) for mixing fat or oil, which is fed as starting materials, the raw alkyl ester and/or biodiesel end product, with an agent.    DESCRIPTION OF DRAWING(S) - The figure shows schematic representation of a device for producing fatty acid alkyl esters (Drawing includes non-English language text).    Reaction zone (1, 4)    Mixing reactor (2, 5)    Separator (3, 6)    Mixing device (26, 27, 28)    Wash column. (21)