US Patent 7422021 Method of cleaning oil strainer

A method for cleaning an oil strainer in an oil pan of an internal combustion engine from which substantially all lubricant has been drained, the method comprising connecting a first conduit to said oil pan; introducing a cleaning fluid into said oil pan; connecting a second conduit to an opening on said engine; creating a circuit by a pressure pump wherein said cleaning fluid moves from said oil pan, through said opening, through said oil strainer and back into said oil pan; and evacuating the cleaning fluid from the engine.