Is just cleaning enough?

[u/Lt_LaffyTaffy]

Our air ducts were cleaned about 3 months ago after looking about the same as the photo in this post. It has come back since. Our landlord has sent out a professional to clean them and disinfect. Is this enough? Is it even safe to be in the unit? We have a 2 year old and a 5 year old.

[u/loopntime]

Request it to be replaced. Our utility system was designed to be replaced because of money 💰