We have been having a problem with mold or mildew (white, greenish, and pinkish) growing on our walls, especially in our two bedrooms behind things, i.e. headboard, dresser, etc. This happens mostly on the exterior walls, in the corners, but also in the windows. They are double-paned, vinyl. I don't know too much about this type of thing, but I have done some research and it looks like this happens due to too much moisture (humidity) plus not enough air circulation. I'm also under the impression that part of the moisture problem is from condensation, from the inside temp being warmer than the outside temp, and it is worsended by the fact that the walls may not be insulated. I did check under the house. We have a partially dug-out basement and I can see to the foundation which is cinderblock. The soil on the inside of the foundation is completely dry. The floor is garvel and soil, and is moist. We have a hole with a sub-pump down there and it rarely runs. When we discovered the problem, I washed those areas of the walls with a strong bleach solution and we made an effort to strike it with Lysol now and again. We were also running a dehumidifier all the time and that seemed to keep the problem at bay. We recently got our electric bill and decided to cut down on the dehumidifier use due to the cost. Now the stuff is back. Any thoughts from those of you who know about this type of thing would be most appreciated. We are looking for advice on how to actually fix the problem, not just deal with it. Thanks in advance!