Sprayer won't spray:
Usually when we hear this the batteries need to be put in the other way.
Sprayer not spraying/misting like when I first got it:
Try a fresh set of batteries
Sprayer filter is clogging:
It is supposed to. The filter at the end of the hose is designed to protect the pump in the sprayer. Strain any grainy/seasoned liquid before putting into the bottle.