Mouse Smell In Ducts Over 1 year now - will it sell?

If the smell is from the heat ducts, try what worked in our house. Somehow a mouse got in the heat ducts and eventually died. and smelled. the exterminator told us to just turn the heat up to max in the house and let the furnace run for for 6-8 hours with windows open. the heat will dry out the carcass and smell will go away.

He was spot on. so you might try this in the trailer as well.