I was amazed by the process, I find it very interesting how they get all the dust and dirt out of the air ducks. I never done it before and we are just having a lot of allergies and dust at our house
So the way the clean air ducts is they basically put everything under vacuum pressure, and then brush all the inside with a roto rush, this loosens and frees the dirt so that it can get sucked into the big vacuum machine.
It's was an interesting process, I am very happy with the results and would use again, well in a year or two