I prefer the 'behind the radio' method. I do it from the frunk only if I'm also replacing the heater core.
Here's the big discussion thread. Looks like you posted in it about 5 years ago. It's about time you got to work on it. http://986forum.com/forums/performance-technical-chat/42802-interior-vent-debris.html 
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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