Abstract: A directed flow apparatus is proposed for improving the mechanical washing of surgical instrument handpieces. The apparatus takes the form of a cleaning adaptor that is designed to attach to the distal opening of the handpiece and an inlet port connector inserted on a fluid jet of the mechanical washer. A suitable length of tubing is connected between the cleaning adaptor and the inlet port connector so that when the washing cycle begins, a high force stream of cleaning fluid is specifically directed into the interior of the handpiece and focusing the direction of the cleaning fluid into a channel that is not easily accessible otherwise.