I have never had a mold problem before. I am renting a flat in an old house and under the paint the walls feel like paper. There has been a great deal of moisture in our place lately, and mold is growing in the corners of the bedrooms behind the dressers. How do I get rid of the mold that sinks into the wall? We can get the surface looking clean but are left with spots of mold in the wall. Can anyone help? Thanks.