Cleaning solution and methods of cleaning a turbine engine

A method of cleaning a turbine engine, the method comprising:

• directing a cleaning solution towards a component of the turbine engine having a layer of foreign material thereon, the layer of foreign material formed at least partially from at least one of thermal reaction products of the foreign material and interstitial cement, to at least partially remove the foreign material from the component, the cleaning solution comprising
• water within a range between about 68.65 percent and about 99.63 percent by volume of the cleaning solution;
• a first organic acidic component within a range between about 0.1 percent and about 15 percent by volume of the cleaning solution;
• wherein the organic acid comprises citric acid;
• a second organic acidic component within a range between about 0.1 percent and about 15 percent by volume of the cleaning solution;
• wherein the organic acid comprises glycolic acid;
• isopropylamine sulphonate within a range between about 0.07 percent and 0.14 percent by volume of the cleaning solution;
• alcohol ethoxylate within a range between about 0.035 percent and 0.07 percent by volume of the cleaning solution;
• triethanol amine within a range between about 0.035 percent and 0.07 percent by volume of the cleaning solution;
• sodium lauriminodipropionate within a range between about 0.03 percent and 1.0 percent by volume of the cleaning solution;
• wherein the cleaning solution has a pH value in the range between 2.5 and 7.0.