I second all of these experiences. I used a dehumidifier in my damp basement. It contributed greatly to feelings of comfort, and it did increase the electric bill.
Â
In your case I do believe bleach is your friend. I washed the walls with bleach solution, and I did paint it over with Kilz brand paint (this was in response to a flood in the basement, not just to deal with "regular" mold/dampness issues). But I think the paint helped in the long run to keep things from growing up the walls.
Â
Â
If you are dealing with a damp basement, ironically, you don't want to bring fresh air from the outdoors into the basement. As it comes down from upstairs, it cools and the water condenses, so you're just bringing in water if you do that.
Â
If you're on the ground floor or above, I would think that regular airing would help, BUT in the winter, if you're bringing in cool/cold damp air, then you're also just bringing in moisture. (I would think, but someone can correct me on this.)
Â
Does your bathroom vent to the outside? If not, you should open the window a crack after your shower.