I just bought a 1989 D250 12 valve. The owner had it sitting in a barn for years and mice had gotten inside. I used an ozone machine and that got rid of the smell inside the cab but unfortunately when the ac/heat is on, the smell comes through the vents. I used compressed air and blew out all of the air vents removing a lot of insulation the mice used and poo. I used a hole saw and cut a hole into the heater box and removed all of the mouse stuff in there. I would rather not have to remove the box so I want to try everything else before I may have to. Any suggestions to somehow disinfect and clean the air vents thoroughly without tearing it apart? I’ve looked into the ac duct cleaning foam.