Problem solved.

* Set the AC thermostat to minimum temperature so that it's always actively
cooling.
* Then put a humidifier in front of it for a few days.
* Spray the intake with copious amounts of Vim cleaning fluid (had nothing
else on hand) periodically over the course of a couple of days.

Then I turned the thermostat back up to 24 and the foul smell seems to have
gone away. It was most likely a fungal or bacterial growth that got flushed
out with the help of a lot of water and Vim cleaning fluid.
--=20
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