I recently had my air ducts cleaned. It was the first time. The two technicians were very thorough explaining the process. During the first visit, they discovered some exposed asbestos tape in my basement an in the large portion of my return air duct. I had to take care of that before they came back two days later to clean. I was appreciative of them educating me. I had no idea I had exposed asbestos, and I am glad I hadn't done anything to disturb it. They did an awesome job cleaning my ducts when they returned the second visit. My only regret is that I didn't have it done sooner.
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