Anyone else: mildew?
 

Weird ass smell from Air Vents,

Smells like Wet Dog,

or Rotting food,

or Pool of Saliva,

Tried to put alcohol near vents, All I smell is alcohol, once it dissipates, and I turn on Air Blower, Smell this bad smell again

Maybe it's time for a cabin filter change? Even if it's not time for a change based on mileage or time, sometimes based on the environment you drive in it may warrant a change sooner.. For example, some CA members have changed their filter ahead of time due to the wildfires they experienced..

Check under your hood, if the smell is that bad it could be that a rodent crawled up under your hood and left a mess or died.. .

changed Cabin air filter already

I had this issue before. I think it's moisture building up from running the A/C with the system on re circulation. I took out the cabin filter ran the system on high with the recirculation off and sprayed lysol disinfectant spray into the outisde vent..

Someone suggested spraying Ozium in to the vents on the footwell while the AC was recirculating air. I've heard Lysol, too, but I've heard good things about Ozium and people seemed more open to doing that rather than Lysol disinfectant.

Is your "AC" on, or do you turn that off while running the heat in the winter?

I always use the AC button to turn on my HVAC, regardless of the temperature. I feel like when I've used the heater with the AC button off in the past the windows fog up.

Yeah, you are supposed to, hence was asking the OP