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

If you really want to get rid of it you need to hire a duct cleaning professional. Just running air through it won't cut it. You need something that pulls the air out and using a duct cleaning brush (google that) you can buy some off of Amazon if you want to try it cheap. You need to find away to get the dried urine out, and that's beyond what I'd know how to do.