What is the most cost effective way to remove mold from AC vents,

[Mike X.]

I found out that I may have mold in the air conditioning vents in my condo, never having to deal with this before I'm at loss how to proceed with  mold removal. To complicate the matter I'm putting the property for sales but at loss where to start with cleaning vents from mold / mildew. Any suggestion from a member who dealt with similar problem and have cost effective solution would be appreciated.  Also if someone who dealt with this issue   in south Florida and could PM me reliable service name that can remove mold from AC vents. I'm in Hallandale Beach on border of Broward and Dade counties.