Air duct cleaning: Contractor says its mold

[Leonard Smith]

Hello BP family, My wife and I had a contractor come out to do our air duct cleaning. My wife was the only person here when the contractor got here as I was still at work. After the cleaning he says that there is mold and that the cost to remove it is $1050. I had a buddy of mine who does mold inspection look at the video and he says its more than likely just dust build up and the coils just need a good cleaning which is a couple hundred vs the $1050. I will try and post the video so you all can see as well. My friend also said this is a common practice among some dishonest contractors to play on people's ignorance to make more money. What are your thoughts?