I've installed that product many times, long ago. It was very popular for a while. It can be cleaned only on the aluminum foil side (outside). If it's disintegrating or dirty, get a professional to replace it with something else. Don't mess with it yourself.
source https://www.inspectorsjournal.com/topic/18951-fiberglass-ductboard-replace-or-no/?do=findComment&comment=173037
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