My 1876 house is built on a foundation of fieldstone and brick. At some point, both the exterior and interior of the foundation were covered with stucco. Also, someone had covered the interior stucco with plastic sheeting and panelling, which we have removed. The interior stucco is bowed and crumbing in some areas of the basement, and there is evidence of some mold (not too extensive as far as we can see) in some areas. We have removed some of the stucco. We are not sure if we should continue removing the stucco to treat the mold, and, if we do, should it be replaced? Also, can we clean the fieldstone with a detergent/bleach solution, or is there a better approach? And, overall, what is the best way to maintain this kind of foundation?