Firstly disconnect the spray wand from the gun before cleaning the nozzle! After that clean the nozzle with a small piece of wire such as a paper clip Flush the injector with water Reconnect the wand to the spry gun Restart the washer and press the trigger on the gun If the nozzle is still partially plugged or plugged, again repeat the first four steps If all the above instructions never work now replace the nozzle with a new one.