The invention relates to a washing or cleaning agent with reduced viscosity fluctuations at various pH-values and/or with the use of various scents, containing surfactants and other typical substances in washing or cleaning agents, wherein the agent contains (a) 0.1 to less than 5% by weight of a fatty acid and/or a fatty acid salt and (b) 0.01 to less than 0.5% by weight of a (meth)acrylic acid (co)polymer. The invention further relates to the use of a combination of (a) 0.1 to less than 5% by weight of a fatty acid and/or of a fatty acid salt, and (b) 0.01 to less than 0.5% by weight of a (meth)acrylic acid (co)polymer for the stabilization of a liquid washing or cleaning agent which contains surfactants, a silicone compound, and other typical substances of washing or cleaning agents.