It may be blocked.....or the tubing may have a hole it it.....
Easy, start at the wiper fluid bottle and unplug the hose. Try the squirter button and see if the motor squirts out fluid. If it DOES then pull off the hose where it goes into the wiper blades and try the button again. Keep working your way up the system until you find out where the blockage is. My guess is the nozzles. You could also do a quick clean by sticking a needle into the nozzles to unblock them.
Agh I totally fell for this spammer too! Damn!