Locate the main shutoff valve on your irrigation system. It is between the main water supply to your home and the sprinkler controller. Alternately, the main shutoff is located outdoors near a faucet bib. The main valve may be in a box in this area to protect it from the elements.
If manual cleaning is not performed immediately, instruments should be placed into a container and soaked with a detergent, a disinfectant/detergent, or an enzymatic cleaner to prevent drying of patient material and make manual cleaning easier and less time consuming.
1 Again, cleaning the instruments is not meant to sterilize them. This step just prepares them for sterilization. Sterilization will destroy all microorganisms on the surface of the instrument, preventing infection.  Use caution when handling careful sharp items like scissors, blades, and other sharp implements.