That's the first I've heard of a mouse being in the AC duct. My concern would be how did he get in there? Did he chew his way into there? If so, what is the condition of the duct? You may now be blowing conditioned air into the attic and have reduced efficiency of your AC system.
That said, mice do not like the smell of peppermint and spearmint. Once there, the oder will not drive them out. It will only keep them out when they are looking for a place to inhabit. You can buy bottles of peppermint oil and place a few drops on cotton balls. Leave them in areas where the mice could get in. You'll have to renew the drops every couple of weeks.
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2012 Cedar Creek 36CKTS Touring Edition
2015 Ford F-350 CC DRW Lariat
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