Ultrasonic cleaning system and method

A method comprising:

• inserting an ultrasound probe into an engine;
• delivering an ultrasound coupling medium between the ultrasound probe and one or more components of the engine, the ultrasound coupling medium acoustically coupling the ultrasound probe with the one or more component of the engine;
• emitting a focused ultrasound pulse from the ultrasound probe and through the ultrasound coupling medium to deposits on a surface of the one or more components of the engine;
• removing the deposits from the one or more components of the engine via the focused ultrasound pulse transmitted to the deposits, through the ultrasound coupling medium, from the ultrasound probe;
• wherein the surface of the one or more components of the engine is an external surface and the one or more components include an opposite internal surface, and wherein the ultrasound coupling medium is delivered onto the external surface, and wherein emitting the focused ultrasound pulse includes focusing the ultrasound pulse through the ultrasound coupling medium delivered on the external surface of the one or more components of the engine and onto the internal surface to remove the deposits from the internal surface;
• and
• changing a frequency of the focused ultrasound pulse delivered by the ultrasound probe based on a thickness of the one or more components between the internal surface and the external surface.