After 20+ years the mold and fungi living on the UNDERSIDES of sole,
cabinetry; BEHIND all those closed spaces will qualify as an official
'mushroom farm'. Only way to rid it is to open it, scrub it and
leave some 'caustic' to prevent its reinfection.
Aspergellus, Stochybatris are common and harmful molds that THRIVE in
those spaces ... only way to rid them is to SCRUB them, etc. No
perfumes, no deodorants, no magic potions .... as if you dont REMOVE
them the dead cells only become nutrient sources for 'other' species.

Got soap? Got scrub brush?