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Work after dark, use a flashlight or drop light. Sunlight contracts your pupils such that every time you try to see what's what in the dark up under the dash you need to wait for pupil dilation.
Disconnect enough to see where the defrost vent is connected to the dash underside by rubber thingies (technical term) through a galvanized metal panel. You might be able to leave the duct to the dash vent and the floor vent connected to the defroster vent. Makes things easier if you can.
The rubber thingies are designed to get thinner as you pull on them. Problems are (1) rubber might be old and hard and brittle, be careful, and (2) Pull with a pair of pliers or Vise-grips.
If they work, the center part of the thingie gets skinny enough to just slip out of the keyhole shaped hole in the metal panel.
Wrest the duct off the blower turbine housing. There may be some weather strip in there for a seal. You will demolish the staples. When reinstalling, I get a short pan head sheet metal screw on my electric screwdriver to hold the ducts together.
If the stuff is in the duct - hooray. If it flowed on into the blower turbine housing, you must choose between smell and huge job. Maybe there is a countervailing smelly stuff to add??
If the stuff is in the ductwork, I would put the whole thing into a freezer for 30 min or so and see if it can be chipped out is large pieces.
Good Luck,
Bob
:>)
PS: I may have some surplus right side ductwork in BGVPD. Let me know if you need it.
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