Damp in walls usually comes from bellow out of the ground. if there is dampness in the wall this indicates that the damp course is either damaged or even non existent another possibility is that...
Those Mr. Clean magic erasers work really good! Just work at it, don't epect it to come off easy like in the commercial. If you have tryed I have no idea
First find the source of the dampness that is causing the smell and fix that issue. You may need to replace drywall or flooring that has become too wet. Otherwise, cleaning with bleach or other...
When storing materials, packing such buffers as silica gel with the goods before sealing the container will help keep excess moisture at bay. For basements, sprinkle chlorinated lime (commonly called...