If it’s mold and you have to ask, then you should probably get a professional.

Pro work. $400 is actually a good price for something like this.

Go with a pro. They have better equipment that will get if not all most of the mold out. Plus they can spray the inside of the duct work with an antifungal agent to stop mold growth from reoccurring.

Yeah, sorry man but this is a pro job.

at the same time, I would recommend looking into ways of stopping this from reoccurring. maybe insulating your duct work different things like that.

I am sure the remediation professional can give you some recommendations once they check things out.

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I would really like to know how you have mold growing inside ductwork.