A modular foam cart for washing a gas turbine engine, the modular foam cart comprising: a detergent reservoir for storing wash fluid; a pump configured for receiving a flow of wash fluid and pressurizing the flow of wash fluid; a foam generating device in fluid communication with the pump, the foam generating device being configured for aerating the flow of wash fluid to generate a flow of foamed wash fluid; and a wash module comprising: a plurality of wash lines; a plurality of spray nozzles each attached to a respective wash line, each spray nozzle including an attachment portion for substantially air-tight and water-tight attachment to a respective borescope hole in a gas turbine engine; a distribution manifold in fluid communication with the foam generating device, the distribution manifold being configured for selectively directing the flow of foamed wash fluid through the plurality of wash lines, wherein the distribution manifold comprises a plurality of valves, wherein each of the plurality of valves fluidly connects a respective one of the plurality of wash lines to the foam generating device; and a controller in operative communication with the foam generating device, the controller being configured for manipulating one or more foam quality characteristics of the flow of foamed wash fluid based on one or more operating characteristics of the gas turbine engine; wherein each of the plurality of valves is individually operably connected to the controller, such that the plurality of valves are operable independently from one another. a detergent reservoir for storing wash fluid; a pump configured for receiving a flow of wash fluid and pressurizing the flow of wash fluid; a foam generating device in fluid communication with the pump, the foam generating device being configured for aerating the flow of wash fluid to generate a flow of foamed wash fluid; and a wash module comprising: a plurality of wash lines; a plurality of spray nozzles each attached to a respective wash line, each spray nozzle including an attachment portion for substantially air-tight and water-tight attachment to a respective borescope hole in a gas turbine engine; a distribution manifold in fluid communication with the foam generating device, the distribution manifold being configured for selectively directing the flow of foamed wash fluid through the plurality of wash lines, wherein the distribution manifold comprises a plurality of valves, wherein each of the plurality of valves fluidly connects a respective one of the plurality of wash lines to the foam generating device; and a controller in operative communication with the foam generating device, the controller being configured for manipulating one or more foam quality characteristics of the flow of foamed wash fluid based on one or more operating characteristics of the gas turbine engine; wherein each of the plurality of valves is individually operably connected to the controller, such that the plurality of valves are operable independently from one another. a plurality of wash lines; a plurality of spray nozzles each attached to a respective wash line, each spray nozzle including an attachment portion for substantially air-tight and water-tight attachment to a respective borescope hole in a gas turbine engine; a distribution manifold in fluid communication with the foam generating device, the distribution manifold being configured for selectively directing the flow of foamed wash fluid through the plurality of wash lines, wherein the distribution manifold comprises a plurality of valves, wherein each of the plurality of valves fluidly connects a respective one of the plurality of wash lines to the foam generating device; and a controller in operative communication with the foam generating device, the controller being configured for manipulating one or more foam quality characteristics of the flow of foamed wash fluid based on one or more operating characteristics of the gas turbine engine; wherein each of the plurality of valves is individually operably connected to the controller, such that the plurality of valves are operable independently from one another.