Patent ID: 8809248

Claim:
A method of cleaning an engine having at least one combustion chamber, comprising: (a) providing a composition comprising: (i) 10-90 wt % of an alkanol amine hydroxy carboxylate represented by formula (I): RCHOHCOONH a+1 ((CH2) n OH) b (I) wherein n is an integer in the range of 1 to 10; a is 0, 1 or 2; b is 1, 2 or 3; such that a+b=3; R represents hydrogen atom or alkyl; (ii) 10-90 wt % of a surfactant; (iii) 0-80 wt % of a solvent; and (iv) 0-80 wt % of water; (b) introducing the composition into the combustion chamber; wherein the surfactant is selected from the group consisting of benzenesulfonic acid, a fatty alcohol ethoxylated, propylene glycol monomethyl ether, and alkyl dimethyl hydroxy ethyl ammonium chloride.