Cleaning Heater/Air-conditioner Ducts - Tips needed

[CatusBronco]

Does anyone have any cool tricks for cleaning out heater/air-condition ducts.

My 1996 F350 has a lot of stuff caked in on the inside of the vent ducts. I was able to clean the two on the driver's side to some degree today while I had my dash cluster gauge repaired. Hate to blow air with high pressure air hose at risk of blowing the seams apart in the ducts.

Thanks in advance.

[glovemeister]

I'd try cotton swabs and some of that ac duct cleaning spray.

[shane772]

I've always used a cleaner followed by air. My detail shop here in Tulsa has a spray now that supposedly you can spray on and leave, not sure how well it works though.

[CatusBronco]

Thanks for your input. Did just that yesterday. Used AC cleaner plus another round of special disinfectant. Truck smells great now.