Is my windshield fluid squirter jammed, or something more?

I have a Honda CR-V (2000), and have been having trouble with the windshield fluid squirter; namely, it doesn't squirt. When I try to use it, the wiper blades activate as normal, but no fluid will come out. I did a Very cursory once over (I am Not an automotive whiz chick <yet>), the rubber tubing leading to the squirter didn't seem jammed, though I haven't been able to get all the way down to where it meets the reservoir just yet. Is there an easy way to determine if this is a clog, or something more serious? If I blast some compressed air through the tubing, could that help? Or am I running the risk of doing damage of some sort?

Thanks in Advance, you guys are Awesome!