Cleaning fiberglass ducts

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I apologize for not submitting my profile yet but I have been very busy. I am working on my 1998 16x80 Fleetwood that has been burned, and because of that the (square rigid) ductwork is EXTREMELY dirty. There is a lot of loose insulation, tiny pieces of wood, dirt and also the usual crap that finds its way down the vents. I have removed the furnace that sat inside the home and now I have a 12"x12" access to the ductwork. Anyone have any ideas how to clean down there? Any help would GREATLY appreceiated. Thanks...George

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Hi George,

Those ducts are very flimsy and often have seperations, holes, openings.

Clean VERY gently and do not use any liquids.

Try vacuuming from each register and wiping with a damp towel.

Normal type extensive cleaning will destoy the duct and probably damage the underbelly.

Take care and best wishes,
Robert