Dead rodent smell emanating from furnace ducts

[retiredlucent]

Turned on the furnace in my Wildcat Sterling for the first time this year and what a smell. It smells like something died, maybe a dead rodent
and now the whole trailer smells really bad. I know there is usually a smell on start up but this is more pungent. Any ideas on how to access the ductwork and clear the smell.

[5picker]

Dead mice/chipmunk/squirrels smell is a common complaint on R/V forums.

Short of pulling the ducts off, you might use a video camera scope (inexpensive on amazon/ebay) To look for the dead stuff.