Need recommendation for air duct cleaning
 

We need to have the air ducts cleaned in our home, has anyone found a reputable contractor in the area that closes off all the vents but one and then attaches the vaccum to the system? We have had two so far and neither have done that...so essentially the ducts were not actually fully cleaned. We had this done at our home up north, so we know what to expect with a good cleaning. So far, no one in Florida has had their ductwork cleaned, thanks for any suggestions!