Iobito - you can but from Sharper Image or other specialty stores an 'air ionizer' that plugs into your cigarette lighter. It draws very little power so you can leave it in for a few days no problem w/o starting car. I thought they were nothing but a gimmick, but after twenty nonstop wet days here in Calif (!) a couple of years ago our Exploder started to smell like death itself and the ionizer took care of it. I would think it would work extra-well on mildew.