Patent ID: 8262802

Claim:
A method of removing a deposit from a passage extending through a component, the method comprising: immersing the passage within a liquid bath; directing a first liquid jet at the passage from a source within the liquid bath and with a sufficient velocity so as to remove at least a portion of the deposit, the component being made from metal and the deposit is ceramic, and contiguous with a coating provided on a first surface of the component; and directing a second liquid jet at the passage from a second source within the liquid bath, wherein an angle of the first liquid jet is in line or at a negative rake angle relative to a center axis of the passage; an angle of the second liquid jet is at a positive rake angle relative to the center axis of the passage; the first liquid jet and the second liquid jet are directed at the passage from a second surface of the component opposite the first surface; and the first liquid jet removes the at least a portion of the deposit without substantial removal of the coating provided on the first surface of the component.