My hair mister got clogged with some crud that was in my scenic cement.  To fix it, I was able to pry up the nozzle cover over the black nozzle.  From there, I used some pliers to wiggle the black nozzle off.  It took a fair amount of force before it popped, so maker sure you have room for your hands to move when it does.  I used a micro brush and water to clean some chunks out of the nozzle.  I then pushed it fully back into place and snapped the cover shut.  Mister saved.  Your model and mileage may vary.