Never try to unblock nozzle or enlarge the tiny spray hole with a pin or other sharp objects. This is because it can stop the spray from working.
Clean the nozzle as shown below.
It is important to shake the bottle gently before each use. Also, the bottle should be discarded after 60 or 120 days (depending upon bottle size) or 2 months after starting treatment. Do not transfer any remaining suspension another bottle.