Abstract: A fuel composition is described. The composition contains a hydrocarbon-based fuel boiling in the gasoline or diesel range; a carrier fluid comprising an alkyl polyethoxylate having the following structure: where each R2 and R3 is independently hydrogen, C1-C4 hydrocarbyl group, or C1-C3 alcohol, where R1 is C4-C100 hydrocarbyl group, carboxyl group, ether group, thioether group, or aromatic group, wherein x is from 1 to 20, or a hydrocarbyl phenol having the following structure wherein R is a hydrocarbyl group from C4-C100; an amine-based detergent given by formula 2, R4—O—(CH2)y—NHR5, where the amine-based detergent is present in about 10 ppm to about 750 ppm by weight based on total weight of the fuel composition; where R4 is a hydrocarbyl group having 8 to 20 carbons, R5 is hydrogen or (CH2)zNH2 moiety, and where y, z are independently integers having a value of 2 or greater; and one or more nitrogen-containing detergent.

Abstract: Interior parts of gasoline engines are readily cleaned by a method comprising the steps of connecting an a cleaning liquid supply pipe having a gas supply port thereon airtightly to a port of an intake pipe of the engine below a throttle valve-attached position of the engine; operating the engine to draw cleaning liquid in the form of liquid drop and simultaneously drawing continuously a gas having an oxygen concentration of less than 20 vol. % into the intake pipe; and exhausting the cleaning liquid having been brought into contact with the internal parts of the engine with an exhaust gas.

Abstract: Interior parts of gasoline engines are readily cleaned by a method comprising the steps of connecting an a cleaning liquid supply pipe having a gas supply port thereon airtightly to a port of an intake pipe of the engine below a throttle valve-attached position of the engine; operating the engine to draw cleaning liquid in the form of liquid drop and simultaneously drawing continuously a gas having an oxygen concentration of less than 20 vol. % into the intake pipe; and exhausting the cleaning liquid having been brought into contact with the internal parts of the engine with an exhaust gas.

Abstract: Interior parts of gasoline engines are readily cleaned by a method comprising the steps of connecting an a cleaning liquid supply pipe having a gas supply port thereon airtightly to a port of an intake pipe of the engine below a throttle valve-attached position of the engine; operating the engine to draw cleaning liquid in the form of liquid drop and simultaneously drawing continuously a gas having an oxygen concentration of at least 20 vol. % into the intake pipe; and exhausting the cleaning liquid having been brought into contact with the internal parts of the engine with an exhaust gas.