Engine combustion chamber cleaning solution composition and cleaning method using the same

A method for cleaning an engine combustion chamber, comprising:

• a step of preparing an engine combustion chamber cleaning solution including, based on the total weight of the composition, 74 to 95 wt % of water, 0.5 to 10 wt % of EDTA-4Na, 0.5 to 5 wt % of sodium metasilicate pentahydrate, and 0.5 to 20 wt % of C11-14 ethoxylated propoxylated alcohol (Alcohols, (C=11-14)-iso-, (C=13)-rich, ethoxylated propoxylated) as a surfactant;
• an engine combustion chamber cleaning solution injection step of injecting the cleaning solution into the cylinder of the engine through a spark plug mounting hole located at a portion from which at least one spark plug installed in the engine has been removed, without disassembling the automobile engine;
• and
• a cleaning step in which the cylinder of the engine is immersed in the cleaning solution for a predetermined time so that the cleaning solution performs cleaning, thereby removing carbon deposits adhered to an upper portion of a piston and to a side oil ring inside the cylinder of the engine.