General Technical Questions and Answers last answered over 1 year ago.
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I think you'll have a real job if you can't actually see it. Darned site easier with the dash out but even then the blower unit tends to obstruct access. These pipes tend to keep their shape so it won't be too far away. Shine a torch in the jet hole and see if you can coax it out with some stiff wire?
If the jet is on the dash side you might be able to grab it after removing the instrument cluster.
If not, you're where I am this Bank Holiday - dash out and the front end resembling a 1950s milk float...