Dead Mouse Smell I Always Smell A Dead Mouse Smell In One Of The AC Vents. How Do I Get Rid Of The Smell?

I always smell a dead mouse smell in one of the AC vents. How do I get rid of the smell? - dead mouse smell

He has checked with a kind of CA, and found no holes in the pipes. But I know that it smell.If such thing as a dead mouse a little lavender oil placed on a small plaque