When I was running a kerosene heater in my shop most of a winter, with my car doors closed tight I got a minor amount of fungi also. It did clean up rather easily and never returned. I blame it on the constant change in temperatures and a by product of an un-vented heater is moisture. In addition, the constant temperature cycles and not allowing it to breath is bad, it forms dampness on surfaces. I have since always left the windows cracked a bit. That seemed to solve the problem and lets it breath. Not sure if that is your case, but it was in mine. Clean it up, repeat as needed, use a good vinyl cleaner to recondition. If it comes back repeat. Dont use a chlorine based disinfectant for obvious reason. Something like Clorox Broad Spectrum Quaternary Disinfectant Cleaner may work and is bleach free (Amazon).
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