Are all the ducts made from ductboard or just the return-air duct? It's very common to use it in return-air ducts - particularly in Florida. Less common in supply ducts. Unless the ducts are damaged, I wouldn't replace them. The fiberglass lining tends to catch a lot of dirt, but not release so much. That's why it looks so gross. If you don't believe me, install some little filters behind the supply registers (and maintain your return-air filter). You'll find that the little supply filters don't catch anywhere near the amount of dirt that you imagine is there.
source https://www.inspectorsjournal.com/topic/18951-fiberglass-ductboard-replace-or-no/?do=findComment&comment=173039
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