Lubegard 96030 Kool-It Evaporator and Heater Foam Cleaner
https://a.co/d/0NXPpEe
I know this thread is old. But this is the solution to this moldy, smelly vent problem and compressor failure due to oil loss from liquid slugging caused by a dirty coil. It is also a cause of blower motor resistor failure and blower failure.
If you have never cleaned the coil in it, then I would get the small can and one of these big cans
Frost King ACF19 Foam Coil Cleaner, 19Oz, 19 Ounce
https://a.co/d/j7ipI5e
The spray cap and hose from the little can fits the big one.
Put the little can in first, then the big one, let it sit for the time it says then follow the instructions on the little can about running your air to rinse the coil.
It makes it smell and work better.
Don't forget to rinse the condenser coil from engine side out as well for peak operation.
Hope this helps anyone else that finds their way to this thread like I did.