One of my off-season chores is to clean our trailers AC ducts. They have an endless source of styrofoam bits that shower the living room every time the AC is turned on after the TT has been moved. ...
Yeah, a shop vac as the bits shower down will do the trick, and you can try to suck as many bits out of the duct work as you can which will help. I found that it took a good year of traveling with our new MH to finally get all the loose bits out.
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