Mazda Miata: blocked AC evaporater case

I had posted a few weeks ago about a blocked AC drain, and appreciate
the help. Several people suggested a coat hanger to clear out debris after
removing the drain hose, and others suggested blowing it out with
compressed air.
My question is where do you blow the compressed air? I would think
blowing INTO the drian hole would simply push the gunk farther in?
Thnks!

"mutineer" <com> wrote in message
news:talkaboutautos.com... 
I was one of those who suggested compressed air. However, I took my car
to the dealer's, and they did the job, without charge. They took the car
away, and so I don't know precisely how they did it. I have heard that it's
possible to do damage if you poke around with a coat hanger.