You might also check that the drain is not clogged–pretty simple for any mechanic. Some cars, don’t know if yours is one, also suffer from odors if the cabin air filter gets wet. This would also be emitted through the vents.
There are products available that you spreay into the ventilation system to abate mold. Alcohol is not one of them. Perhaps your husband meant “this car stinks, I’m going for a drink”? That is putting alcohol in something.