I see the same thing writ large when I do HVAC ductwork. 2’ x 4’ Turning vanes completely clogged with 40 years of dust/munge/fur and they wonder why “the heat isn’t getting up there”. I replaced filters on an old building’s roof unit once and it had $1 bills glued to it, it had sucked them up from strip shows two floors down. It’s great once it’s clean though, I bet even these computer repair folks have to admit there’s nothing as satisfying as peeling off that dust blanket.
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