Cleaning AC Ducts

I had an issue with mice/chipmunks this past winter. I found loads of acorn shells and nuts, lots of poop in my camper. I had stuffed steel wool in all the holes I found over the past couple of years.
I want to clean the AC ducts to make sure they haven't made nests there and clean the ducts. Has anyone done this? I've tried to find a diagram of the duct work, but haven't been able to find anything. Any suggestions? Thank you