Mold in my Air Ducts (Vents)?

I just purchased a home 5 months in South FL and the past owner didn’t run AC to much. Well I was cleaning out the Air Ducts ( vent ) and there is mold on them, in each room. What is the easiest solution to get rid of this? This is South FL so it is a problem alot of people have cause of the heat and what not. Thank You :)

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