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Comments
That use can during cool/cold weather can turn dangerous quickly in a vehicle with a Denso climate control design. Plus it actually lends to the breeding of those microbes.
Just on the chance we're talking mould and mildew odor, try this...
Provided you park inside, every evening for 2-3 weeks leave the windows down slightly. It would not hurt to "flush"/purge the system of moisture during your last few minutes of daily drive. Turn off the A/C system/compressor, put the system in "fresh", windows lowered, and with the blower speed max..
It is the dampness of the evaporator/plenum area overnight that promotes the rapid breeding of the spores.
I think "Airsept" is the name of the company that sells the aftermarket EED, Electronic Evaporator Dryer. Worth a read of how and why it works if nothing else.