The house my wife and I just purchased has mold on large areas of the subfloor for the first floor. From the basement, one sees mold on the subfloor and at the meeting of the subfloor and joists. We believe that the worst areas are where they had a leaking waterbed and around the fireplaces. What about spraying a water/bleach mixture? Or am I just totally off. I have a dehumidifier for the warmer times. Thank you.