A method of clearing a grain cleaning system of an agricultural combine is provided. The method includes the step of providing and directing a flow of high velocity air in a first direction about an inlet end of a cleaning shoe. The method further includes the step of monitoring the cleaning shoe in order to detect a change in an operational parameter of the cleaning shoe, wherein the operational parameter is one of a transient effect of a sieve of the cleaning shoe, a flow rate about and exit end of the cleaning shoe and a flow velocity about an exit end of the cleaning shoe. Further, the method includes the step of redirecting the flow of high velocity air about the inlet end of the cleaning shoe in a second direction in response to a detected change in the operational parameter.
