For what it is worth, I've replaced all my A/C ducts & most heater ducts with solid tubing to increase air flow. What I removed was visably clean, but had some leaks.
No sure how one would clean the flexable ducts as over time they do become brittle.
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Gordon Hummel
1991 41.5' #266
8v92
2009 Pontiac Vibe GT Toad
Fulltime on the road
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