A stable flowable aqueous composition comprising less than 65 wt% water and at least two component surfactants, each component surfactant having a maximum solubility in water at which a saturated solution forms, wherein the total concentration of all surfactants present in the composition is greater than would be obtained by combining equivalent amounts of saturated solutions of the component surfactants; wherein at least one component surfactant includes a compound of formula: wherein R 1 represents a C 4-36 alkyl group; each of R 2, R 3, R 4 and R 5 independently represents a hydrogen atom or a C 1-4 alkyl group and wherein at least one of R 2, R 3, R 4 and R 5 is not hydrogen and M + represents a cation; wherein the second component surfactant is selected from alkyl betaines, alkylamidopropyl betaines, alkylamidopropyl hydroxy sultaines, alkylampho acetates, alkylamphodi-acetates, alkylamphopropionates, alkylamphodipropionates, alkyliminodipropionates, alkyliminodiacetate, salts of C 12 to C 18 carboxylic acids, ethoxylated carboxylic acids, ester carboxylates and ethoxylated ester carboxylates and sarcosinates; alkyl sulfates, alkyl ether sulfates, alkyl aryl sufonates, alkyl amine oxides, alkylamidoamine oxides, alcohol ethoxlates, ethylene oxide/propylene oxide copolymer derived surfactants, sugar esters, sorbitan ester alkoxylates, glyceryl ester alkoxylates, alkyl polyglucosides, fatty acid ethoxylates, polyethylene glycol esters and partial esters, fatty alkanolamides, quaternary ammonium compounds, tertiary amine salts, salts of fatty acids; alkali metal salts of mono- or dialkyl sulfates; mono- or dialkyl ether sulfates; lauryl ether sulfates; alkyl sulfonates; alkyl aryl sulfonates; primary alkane disulfonates; alkene sulfonates; hydroxyalkane sulfonates; alkyl glyceryl ether sulfonates; alpha-olefinsulfonates; alkyl phosphates; sulfonates of alkylphenolpolyglycol ethers; salts of alkyl sulfopolycarboxylic acid esters; alkyl sulfosuccinates and salts thereof, alkyl ether sulfosuccinates and salts thereof, non-acylated alkyl isethionates; fatty acid taurates; acyl taurates; products of condensation of fatty acids with oxy- and aminoalkanesulfonic acids; sulfated derivatives of fatty acids and polyglycols; alkyl and acyl sarcosinates; sulfoacetates; alkyl phosphates; alkyl phosphate esters; acyl lactates; alkanolamides of sulfated fatty acids; salts of lipoamino acids; and the sodium, potassium, ammonium, magnesium and triethanolamine salts of the above. R 1 represents a C 4-36 alkyl group; each of R 2, R 3, R 4 and R 5 independently represents a hydrogen atom or a C 1-4 alkyl group and wherein at least one of R 2, R 3, R 4 and R 5 is not hydrogen and M + represents a cation; wherein the second component surfactant is selected from alkyl betaines, alkylamidopropyl betaines, alkylamidopropyl hydroxy sultaines, alkylampho acetates, alkylamphodi-acetates, alkylamphopropionates, alkylamphodipropionates, alkyliminodipropionates, alkyliminodiacetate, salts of C 12 to C 18 carboxylic acids, ethoxylated carboxylic acids, ester carboxylates and ethoxylated ester carboxylates and sarcosinates; alkyl sulfates, alkyl ether sulfates, alkyl aryl sufonates, alkyl amine oxides, alkylamidoamine oxides, alcohol ethoxlates, ethylene oxide/propylene oxide copolymer derived surfactants, sugar esters, sorbitan ester alkoxylates, glyceryl ester alkoxylates, alkyl polyglucosides, fatty acid ethoxylates, polyethylene glycol esters and partial esters, fatty alkanolamides, quaternary ammonium compounds, tertiary amine salts, salts of fatty acids; alkali metal salts of mono- or dialkyl sulfates; mono- or dialkyl ether sulfates; lauryl ether sulfates; alkyl sulfonates; alkyl aryl sulfonates; primary alkane disulfonates; alkene sulfonates; hydroxyalkane sulfonates; alkyl glyceryl ether sulfonates; alpha-olefinsulfonates; alkyl phosphates; sulfonates of alkylphenolpolyglycol ethers; salts of alkyl sulfopolycarboxylic acid esters; alkyl sulfosuccinates and salts thereof, alkyl ether sulfosuccinates and salts thereof, non-acylated alkyl isethionates; fatty acid taurates; acyl taurates; products of condensation of fatty acids with oxy- and aminoalkanesulfonic acids; sulfated derivatives of fatty acids and polyglycols; alkyl and acyl sarcosinates; sulfoacetates; alkyl phosphates; alkyl phosphate esters; acyl lactates; alkanolamides of sulfated fatty acids; salts of lipoamino acids; and the sodium, potassium, ammonium, magnesium and triethanolamine salts of the above.