Thank you for your responses. 99% sure it’s not a fish. The smell is coming from the vents. It happens after I run the windshield wiper and sometimes when the airconditioner or heater has been running. I did a little more research and read that it could be the fuse box melting. Sorry about my vagueness - I’m just not sure where he put the alcohol. If it is stagnant water in the AC drain - can that be emptied out easily or does a mechanic have to do it?