We recently purchased a home that had a sump pump back-up during a heavy rainstorm (previous owner had it turned off!!!) The basement (not a walkout) was finished. The panelling and drywall behind the panelling wicked up a lot of moisture, and by the time we got to taking it off, the mildew had set in. Now I have a musty odor down there. We've removed all the wet stuff, but what do I do to get rid of the stink? I've already tossed bleach on everything, and it helped only marginally. I have a dehumidifier running most of the time. It seems to smell better with the air conditioner running, but for the first minute of so the air conditioner runs, I can smell musty odors upstairs. What should I do???