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Yes, I think its best done from inside.
IIRC if you peal back the carpet from the front and center of the passenger foot well, you can see where the tube runs from the AC/heater box through the floorboard. I believe you can simply pull it out on both ends and clean it.
There may be residual water in the box the comes out when you pull out the tube so put some absorbent material down before you disconnect it from the box.
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